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Glossary of Astronomy Terms
beginning with letter I
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Iapetus Tweet Definition of Iapetus Like Definition of Iapetus on Facebook
proper noun
  1. (Greek mythology) A Titan, the son of Uranus and Gaia, and father of Atlas, Prometheus, Epimetheus, and Menoetius.
  2. (astronomy) The third largest moon of Saturn
immersion Tweet Definition of immersion Like Definition of immersion on Facebook
noun
  1. the act of immersing or the condition of being immersed
  2. the total submerging of a person in water as an act of baptism
Indian Tweet Definition of Indian Like Definition of Indian on Facebook
noun
  1. Person from India.
  2. Individual of, or related to, the aboriginal people of the Americas, before the arrival of Europeans. Also: Amerindian, Native American.
  3. (obsolete) An Australian Aborigine.
  4. (obsolete) A Maori.
  5. An Indian meal.
We're going out tonight for an .
adjective
  1. Of or pertaining to India or its people.
  2. Of, or related to, the aboriginal people of the Americas, the people who lived in the Americas before the Europeans came, as well as the descendants of such people.
inferior Tweet Definition of inferior Like Definition of inferior on Facebook
noun
  1. a person of lower stature to another
adjective
  1. of lower quality
Anna had always felt to her brother due to poor school grades.
  1. of lower rank
  2. located below
  3. In botany, inside the flower stalk below the petals. Said of an ovary.
infrared astronomy Tweet Definition of infrared astronomy Like Definition of infrared astronomy on Facebook
noun
  1. (astronomy) the astronomical observation and study of objects, cooler than most stars, using the infrarde part of the electromagnetic spectrum
interferometer Tweet Definition of interferometer Like Definition of interferometer on Facebook
noun
  1. (physics) any of several instruments that use the interference of waves to determine wavelengths and wave velocities, determine refractive indices measure small distances, temperature changes, stresses, and many other useful measurements
intergalactic Tweet Definition of intergalactic Like Definition of intergalactic on Facebook
adjective
  1. Occurring between galaxies.
interplanetary Tweet Definition of interplanetary Like Definition of interplanetary on Facebook
adjectiveinterplanentary
  1. between planets
    Humans are just beginning to explore travel.
interstellar Tweet Definition of interstellar Like Definition of interstellar on Facebook
adjective
  1. between the stars
    It can take centuries for light to travel distances.
  2. among the stars
    Space is littered with particles.
IO Tweet Definition of IO Like Definition of IO on Facebook
initialism (or I/O)
  1. (computing), (electronics) input and output
  2. (grammar) Indirect Object
  3. German abbreviation for (lang, de, in Ordnung) ("all right")
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