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Glossary of Astronomy Terms
beginning with letter I
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Iapetus
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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
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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
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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
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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
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noun
  1. (astronomy) the astronomical observation and study of objects, cooler than most stars, using the infrarde part of the electromagnetic spectrum
interferometer
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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
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adjective
  1. Occurring between galaxies.
interplanetary
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adjective interplanentary
  1. between planets
    Humans are just beginning to explore travel.
interstellar
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adjective
  1. between the stars
    It can take centuries for light to travel distances.
  2. among the stars
    Space is littered with particles.
IO
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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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