astronomy

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noun as·tron·o·my \ə-ˈsträ-nə-mē\

Definition of astronomy

plural

astronomies

  1. :  the study of objects and matter outside the earth's atmosphere and of their physical and chemical properties

Origin and Etymology of astronomy

Middle English astronomie, from Anglo-French, from Latin astronomia, from Greek, from astr- + -nomia -nomy


First Known Use: 13th century


ASTRONOMY Defined for English Language Learners

astronomy

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noun as·tron·o·my \ə-ˈsträ-nə-mē\

Definition of astronomy for English Language Learners

  • : the scientific study of stars, planets, and other objects in outer space


ASTRONOMY Defined for Kids

astronomy

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noun as·tron·o·my \ə-ˈsträ-nə-mē\

Definition of astronomy for Students

  1. :  a science concerned with objects and matter outside the earth's atmosphere and of their motions and makeup



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