Astronomy Definition

The scientific study of matter and phenomena in the universe, especially in outer space, including the positions, dimensions, distribution, motion, composition, energy, and evolution of celestial objects.
American Heritage
The science of the universe in which the stars, planets, etc. are studied, including their origins, evolution, composition, motions, relative positions, sizes, etc.
Webster's New World
A system of knowledge or beliefs about celestial phenomena.
The various astronomies of ancient civilizations.
American Heritage
A book or treatise on this.
Webster's New World

The study of the physical universe beyond the Earth's atmosphere, including the process of mapping locations and properties of the matter and radiation in the universe.


Origin of Astronomy

  • Old French astronomie, from Latin astronomia, from Ancient Greek ἀστρονομία (astronomia), from ἄστρον (astron, “star”), from Proto-Indo-European *h₂stḗr (“star”) + νόμος (nomos, “arranging, regulating”), related to νέμω (nemō, “I deal out”).

    From Wiktionary

  • Middle English astronomie from Old French from Latin astronomia from Greek astronomiā astro- astro- -nomiā -nomy

    From American Heritage Dictionary of the English Language, 5th Edition

Find Similar Words

Find similar words to astronomy using the buttons below.

Words Starting With

Words Ending With