All Words Glossary

Glossary of Math Terms
beginning with letter R
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R Tweet Definition of R Like Definition of R on Facebook
noun
  1. The eighteenth letter of the Appendix:Roman script, English alphabet, preceded by Q and followed by S.
abbreviation
  1. (context, US politics) Republican
    1. (film certification) restricted
    2. reverse
    3. right (as opposed to left)
    4. (context, handbells) ring
    5. (context, baseball, cricket) The statistic reporting the number of runs scored by a player
    6. Thursday
r. Tweet Definition of r. Like Definition of r. on Facebook
abbreviation
  1. rare
rad Tweet Definition of rad Like Definition of rad on Facebook
noun
  1. (metrology) A non-SI unit of absorbed dose of radiation, equal to 0.01 gray.
adjective
  1. (slang) excellent, short for radical
radial Tweet Definition of radial Like Definition of radial on Facebook
noun
  1. a radial tire / radial tyre
adjective
  1. arranged like rays that radiate from, or converge to a common centre
  2. moving along a radius
  1. (anatomy) of, or relating to the radius bone
radian Tweet Definition of radian Like Definition of radian on Facebook
noun
  1. (geometry) In the International System of Units, the derived unit of plane angular measure of angle equal to the angle subtended at the centre of a circle by an arc of its circumference equal in length to the radius of the circle. Symbol: rad
radical axis Tweet Definition of radical axis Like Definition of radical axis on Facebook
noun
  1. (mathematics) a radical line
radicand Tweet Definition of radicand Like Definition of radicand on Facebook
noun
  1. (mathematics) The number or expression whose square root or other root is being considered; e.g. The 3 in <math>\sqrtn{3}</math>
radii Tweet Definition of radii Like Definition of radii on Facebook
noun
  1. (plural of, radius)
radiosymmetrical Tweet Definition of radiosymmetrical Like Definition of radiosymmetrical on Facebook
adjective
  1. having radial symmetry
radius Tweet Definition of radius Like Definition of radius on Facebook
noun (radii, pl2=radiuses)
  1. (anatomy) The long bone in the forearm, on the side of the thumb.
  2. (geometry) A line segment between any point on the circumference of a circle and its center/centre.
  3. (geometry) The length of this line segment.
radix Tweet Definition of radix Like Definition of radix on Facebook
noun
  1. A primitive word, from which spring other words.
range Tweet Definition of range Like Definition of range on Facebook
noun
  1. Line or series of mountains.
  2. Large fuel-burning stove.
  3. Selection, array. Eg: A range of cars.
  4. Area used for shooting, artillery, etc.
  5. An area of open, often unfenced, grazing land.
  6. (mathematics) The set of values (points) which a function can obtain.
  7. (statistics) The length of the smallest interval which contains all the data. It is calculated by subtracting the smallest observations from the greatest.
  8. The distance to a target, or to the subject of discussion.
We could see the ship at a range of five miles.
  1. (sports) (baseball) The defensive area that a player can cover.
Jones has good for a big man.
  1. (music) Compass - The scale of all the tones a voice or an instrument can produce.
  2. (ecology) The geographical area or zone where a species is normally naturally found.
verb (ranges, ranging, ranged)
  1. (intransitive) (followed by over) To travel over (an area, etc) with a particular purpose.
  2. (intransitive) (mathematics, computing; followed by over) Of a variable, to be able to take any of the values in a specified range.
The variable x ranges over all real values from 0 to 10.
  1. (transitive) classify
ratio Tweet Definition of ratio Like Definition of ratio on Facebook
noun
  1. A number representing a comparison between two things.
  2. A judicial decision.
rational function Tweet Definition of rational function Like Definition of rational function on Facebook
noun
  1. (mathematics) Any function whose value can be expressed as the quotient of two polynomials (except division by zero)
rationalize Tweet Definition of rationalize Like Definition of rationalize on Facebook
verb (rationaliz, ing)
  1. to make something rational
  2. to justify an immoral act, or illogical behaviour
  1. (mathematics) to remove radicals , without changing the value of an expression or the roots of an equation
    1. to structure something along modern, efficient and systematic lines, or according to scientific principles
rational number Tweet Definition of rational number Like Definition of rational number on Facebook
noun
  1. (mathematics) A real number that can be expressed as a ratio of two integers.
real Tweet Definition of real Like Definition of real on Facebook
noun
  1. A commodity; see reality.
  2. (grammar) One of the three genders that the common gender can be separated into in the Scandinavian languages.
adjective (er, more)
  1. That can be characterized as a confirmation of truth.
  2. That has physical existence.
No one has ever seen a real unicorn because they don't exist.
  1. (economics) Having been adjusted to remove the effects of inflation; contrasted with nominal.
real consumption
real GNP
  1. (economics) Relating to the result of the actions of rational agents; relating to neoclassical economic models as opposed to Keynesian models.
  2. (mathematics) Relating to numbers with a one-to-one correspondence to the points on a line.
  3. Relating to immovable tangible property.
real estate
real property
  1. That is an exemplary or pungent instance of a class or type.
a real problem
a real hero
  1. Genuine, not faked.
real tears
  1. Genuine, not artificial.
real leather
  1. (slang) Signifying meritorious qualities or actions especially in regards to enjoying life, prowess at sports and success wooing potential partners.
keeping it real
adverb
  1. (colloquial) really.
real axis Tweet Definition of real axis Like Definition of real axis on Facebook
noun
  1. (mathematics) The horizontal line in the complex plane, every point on which corresponds to a real number
real number Tweet Definition of real number Like Definition of real number on Facebook
noun (pluralreal numbers)
  1. (mathematics) An element of the real numbers; real numbers include the rational numbers and the irrational numbers, but not the imaginary numbers or complex numbers
Every integer is a real number, but not vice versa.
  1. (computing) A floating-point number.
Even if you pass sqrt an integer, it returns a real number.
real part Tweet Definition of real part Like Definition of real part on Facebook
noun (pluralreal parts)
  1. (complex) Of a complex number a + bi, the value a.
reciprocal Tweet Definition of reciprocal Like Definition of reciprocal on Facebook
noun
  1. (arithmetic) Of a number, the number obtained by dividing 1 by the given number; the result of exchange, exchanging the numerator and the denominator of a fraction.
0.5 is the reciprocal of 2.
adjective (notcomp)
  1. Of an action, feeling, etc, done, felt, etc, by each of two people to, on or towards the other.
  2. In the contrary or opposite way, order, or direction
rectangle Tweet Definition of rectangle Like Definition of rectangle on Facebook
noun (pluralrectangles)
  1. (geometry) A quadrilateral having opposing sides parallel and four right angles.
rectangular Tweet Definition of rectangular Like Definition of rectangular on Facebook
adjective
  1. Having a shape like a rectangle.
rectangular coordinates Tweet Definition of rectangular coordinates Like Definition of rectangular coordinates on Facebook
nounplural
  1. (mathematics) A less common term for Cartesian coordinates.
rectify Tweet Definition of rectify Like Definition of rectify on Facebook
verb (rectif, i, ed)
  1. (transitive) To correct or amend something.
  2. (transitive, chemistry) To purify or refine, especially by distillation.
  3. (transitive, electronics) To convert alternating current into direct current.
  4. (transitive) To add water to alcoholic spirit to adjust its proof.
reduced Tweet Definition of reduced Like Definition of reduced on Facebook
verb
  1. (past of, reduce)
adjective
  1. Made smaller or less.
    • prices
      1. In cookery, of a sauce, etc., made more concentrated.
    • chicken served with a red wine sauce.
refinement Tweet Definition of refinement Like Definition of refinement on Facebook
noun
  1. The act, or the result of refining; the removal of impurities, or a purified material
  2. high, High-class style; cultivation.
  3. A fine or subtle distinction.
reflex angle Tweet Definition of reflex angle Like Definition of reflex angle on Facebook
noun (pluralreflex angles)
  1. (geometry) An angle greater than 180 degrees but less than 360 degrees.
relaxation Tweet Definition of relaxation Like Definition of relaxation on Facebook
noun
  1. The act of relaxing or the state of being relaxed; the opposite of stress or tension; the aim of recreation and leisure activities.
  2. A diminution of tone, tension, or firmness; specifically in pathology: a looseness; a diminution of the natural and healthy tone of parts.
relaxation of the soft palate
  1. remission, Remission or abatement of rigor.
  2. Remission of attention or application.
relaxation of efforts
  1. unbending, Unbending; recreation; a state or occupation intended to give mental or bodily relief after effort.
  2. (physics) The transition of an atom or molecule from a higher energy level to a lower one.
  3. (music) The release following musical tension.
remainder Tweet Definition of remainder Like Definition of remainder on Facebook
noun
  1. A part or parts remain, remaining after some has/have been removed.
My son ate part of his cake and I ate the remainder.
You can have the remainder of my clothes.
  1. (commerce) Items left unsold and subject to reduction in price.
I got a really good price on this shirt because it was a remainder.
  1. (mathematics) The amount left over after subtracting the divisor as many times as possible from the dividend without producing a negative result. If (dividend) and d (divisor) are integers, then can always be expressed in the form n = dq + r, where q (quotation) and r () are also integers, and 0 &le; r &lt; d.
17 leaves a remainder of 2 when divided by 3.
11 divided by 2 is 5 remainder 1.
repeater Tweet Definition of repeater Like Definition of repeater on Facebook
noun (wikipedia, repeater, repeater (electronic device))
  1. (electronics) an electronic device that receives a weak or low-level signal and retransmits it at a higher level or higher power.
  2. (firearms) a gun that has a store of cartridges and does not need reloading after each shot.
  3. (ufology and similar studies) a person who regularly sees unexplained sightings of paranormal phenomenon.
Note " this term is more commonly used by skeptics of the paranormal, and implies that the witness lacks credibility.
result Tweet Definition of result Like Definition of result on Facebook
noun
  1. A flying back; resilience.
  2. That which results; the conclusion or end to which any course or condition of things leads, or which is obtained by any process or operation; consequence or effect; as, the result of a course of action; the result of a mathematical operation.
  3. The decision or determination of a council or deliberative assembly; a resolve; a decree.
verb
  1. To leap back; to rebound.
  2. To come out, or have an issue; to terminate; to have consequences; -- followed by in; as, this measure will result in good or in evil.
  3. To proceed, spring, or rise, as a consequence, from facts, arguments, premises, combination of circumstances, consultation, thought, or endeavor.
resultant Tweet Definition of resultant Like Definition of resultant on Facebook
noun
  1. anything that results from something else; an outcome
  1. (mathematics) a vector that is the vector sum of multiple vectors
adjective
  1. following as a result or consequence of something
rhombic Tweet Definition of rhombic Like Definition of rhombic on Facebook
adjective
  1. having the characteristics of a rhombus.
rhombohedron Tweet Definition of rhombohedron Like Definition of rhombohedron on Facebook
noun (pl=rhombohedra, pl2=rhombohedrons)
  1. A prism with six faces, each a rhombus.
rhomboid Tweet Definition of rhomboid Like Definition of rhomboid on Facebook
noun
  1. A parallelogram whose adjacent sides are unequal in length
  2. Any of several muscles that control the shoulders
adjective
  1. resembling, or shaped like a rhombus or rhomboid
rhombus Tweet Definition of rhombus Like Definition of rhombus on Facebook
noun ( rhomb, i , pl2=rhombuses)
  1. (geometry) A parallelogram having all sides of equal length.
Riemann surface Tweet Definition of Riemann surface Like Definition of Riemann surface on Facebook
noun
  1. (mathematics) a one-dimensional complex manifold; a generalization of the complex plane
right Tweet Definition of right Like Definition of right on Facebook
noun
  1. That which complies with justice, law or reason.
''We're on the side of in this contest.
  1. A legal or moral entitlement.
You have no to talk to me like that!
  1. The right side or direction.
The pharamcy is just on the past the bookshop.
  1. (context, Politics) The ensemble of right-wing political parties; political conservatives as a group.
The political holds too much power.
verb
  1. To correct
Righting all the wrongs of the war will be impossible.
  1. To set upright
The tow-truck righted what was left of the automobile.
  1. (intransitive) To return to normal upright position.
When the wind died down, the ship righted.
adjective
  1. (archaic) straight, Straight, not bent.
  2. Having reference to a straight line; perpendicular, forming a 90-degree angle.
The kitchen counter formed a angle with the back wall.
  1. Complying with justice, correctness or reason; correct, just, true.
I thought you'd made a mistake, but it seems you were all along.
  1. appropriate, Appropriate, perfectly suitable; fit for purpose.
Is this the software for my computer?
  1. healthy, Healthy, sane, competent.
I'm afraid my father is no longer in his mind.
  1. Designating the side of the body which is positioned to the east if one is facing north. This arrow points to the right: →
After the accident, her leg was slighly shorter than her left.
  1. (archaic, sometimes used in titles) To a great extent or degree.
Sir, I am glad to meet you...
Members of the Queen's Privy Council are styled The Right Honourable for life.
The Right Reverend Monsignor Guido Sarducci
  1. (context, Politics) Pertaining to the political right; conservative.
adverb
  1. exactly, Exactly, precisely.
The arrow landed in the middle of the target.
Luckily we arrived at the start of the film.
  1. very, Very, extremely, quite.
I made a stupid mistake there, didn't I?
    • Ann Hite, Ghost on Black Mountain,
    • : The fog was hard to see through so I was on Tom Pritchard before I saw him.
right angle Tweet Definition of right angle Like Definition of right angle on Facebook
noun
  1. (geometry) An angle of 90 degrees; the bisect of the angle formed by a single straight line.
right triangle Tweet Definition of right triangle Like Definition of right triangle on Facebook
noun (pl=right triangles)
  1. (geometry) A triangle having a right angle as one of its interior angles.
Ring Tweet Definition of Ring Like Definition of Ring on Facebook
proper noun (infl, en, proper noun)
  1. An Irish family name.
RMS Tweet Definition of RMS Like Definition of RMS on Facebook
initialism
  1. (context, electronics, statistics) root mean square, Root mean square.
  2. Railway Mail Service.
  3. Royal Mail Ship.
root mean square Tweet Definition of root mean square Like Definition of root mean square on Facebook
noun
  1. (mathematics, of a set of numbers or values) The square root of the arithmetic mean of the squares.
Rose Tweet Definition of Rose Like Definition of Rose on Facebook
proper noun
  1. (given name, female), vernacular form of the medieval Rosa, reinforced by the English noun rose
  2. A diminutive of the given name Rosemary
round Tweet Definition of round Like Definition of round on Facebook
noun
  1. A circular object.
  2. A circular or repetitious route; hospital rounds.
The guards have started their rounds; the prisoner should be caught soon.
  1. An outburst of a certain event. For example, a round of applause.
  2. A song that is sung by groups of people with each subset of people starting at a different time.
  3. A serving of something; a dishing out of one of something to everybody, as in a round of drinks.
  4. A long-bristled, circular-headed paintbrush used in oil and acrylic painting.
  5. A bullet, or any individual ammunition shell.
  6. A period of time in a boxing match in which boxers are permitted to fight before being signaled to returned to their designated corner.
  7. (context, engineering, drafting, CAD) A rounded relief or cut at an edge, especially an outside edge, added for a finished appearance and to break sharp edges.
verb (rounds, rounding, rounded)
  1. To shape something into a curve.
The carpenter rounded the edges of the table.
  1. (italbrac, with "out") To finish; to complete; to fill out.
She rounded out her education with only a single mathematics class.
  1. To approximate a number, especially a decimal number by the closest whole number.
Ninety-five rounds up to one hundred.
  1. To turn past a boundary.
Helen watched him until he rounded the corner.
  1. To turn and attack someone or thing.
As a group of policemen went past him, one of them rounded on him, grabbing him by the arm.
adjective (er, more)
  1. circular, Circular or cylindrical; having a circular cross-section in one direction.
We sat at a table to make conversation easier.
  1. spherical, Spherical; shaped like a ball; having a circular cross-section in more than one direction.
The ancient Egyptian demonstrated that the Earth is , not flat.
  1. Lacking sharp angles; having gentle curves.
Our child's bed has corners for safety.
  1. plump, Plump
  2. complete, Complete, whole, not lacking.
The baker sold us a dozen.
  1. (mathematics) Of a number that has been rounded off or approximated.
One hundred is a nice number.
  1. (linguistics) pronounce, Pronounced with the mouth open in the shape of an "O".
adverb
  1. around, Around.
=      
round angle Tweet Definition of round angle Like Definition of round angle on Facebook
noun (pluralround angles)
  1. (geometry) An angle of 360 degrees.

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