astronomy

noun as·tron·o·my \ ə-ˈsträ-nə-mē \
|Updated on: 6 Aug 2018

Definition of astronomy

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

Recent Examples of astronomy from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'astronomy.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

The Difference Between astronomy and astrology

Some may find it easy to confuse astronomy and astrology. At one time, these two words actually were synonymous (that is, astronomy once meant what astrology means today), but they have since moved apart from each other. In current use, astronomy is concerned with “the study of objects and matter outside the earth's atmosphere,” while astrology is the purported divination of how stars and planets influence our lives. Put bluntly, astronomy is a science, and astrology is not.

Origin and Etymology of astronomy

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


ASTRONOMY Defined for English Language Learners

astronomy

Definition of astronomy for English Language Learners

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


ASTRONOMY Defined for Kids

astronomy

noun as·tron·o·my \ ə-ˈsträ-nə-mē \

Definition of astronomy for Students

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


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