Definitions
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noun 
  1. (geometry) A line or vector that is perpendicular to another.
adjective 
  1. According to norms or rules.
Organize the data into third normal form.
  1. Usual; ordinary
Felicia baked the bread the normal way.
  1. Healthy; not sick or ill
John is feeling normal again.
  1. Pertaining to a school to teach teachers how to teach.
My grandmother attended Mankato State Normal School.
  1. (informal, pejorative towards homosexuals) Heterosexual.
We don't like your sort around here - this bar is for normal people.
  1. (chemistry) of, relating to, or being a solution containing one equivalent weight of solute per litre of solution.
  2. (physics) (Of a mode in an oscillating system) In which all parts of an object vibrate at the same frequency; See w:normal mode, normal mode
  3. (geometry) Perpendicular to a tangent line or derivative of a surface in Euclidean space.
The interior normal vector of a ideal perfect sphere will always point toward the center, and the exterior normal vector directly away, and both will always be co-linear with the ray whose' tip ends at the point of intersection, which is the intersection of all three sets of points.
  1. (algebra) (Of a subgroup) whose cosets form a group
  2. (algebra) (Of a field extension of a field K) which is the splitting field of a family of polynomials in K
  3. (probability theory) (Of a distribution) which has a very specific bell curve shape
  4. (complex analysis) (Of a family of continuous functions) which is pre-compact
  5. (set theory) (Of a function from the ordinals to the ordinals) which is strictly monotonically increasing and continuous with respect to the order topology
  6. (linear algebra) (Of a matrix) which commutes with its conjugate transpose
  7. (functional analysis) (Of a Hilbert space operator) which commutes with its adjoint
  8. (category theory) (Of an epimorphism) which is the cokernel of some morphism
  9. (category theory) (Of a monomorphism) which is the kernel of some morphism
  10. (category theory) (Of a morphism) which is a normal epimorphism or a normal monomorphism
  11. (category theory) (Of a category) in which every monomorphism is normal
  12. (Of a real number) whose digits, in any base representation, enjoy a uniform distribution
  13. (topology) (Of a topology) in which disjoint closed sets can be separated by disjoint neighborhoods
Etymology: From Latin normalis.


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