from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The scientific study of matter in outer space, especially the positions, dimensions, distribution, motion, composition, energy, and evolution of celestial bodies and phenomena.
- n. A system of knowledge or beliefs about celestial phenomena: the various astronomies of ancient civilizations.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. 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.
from the GNU version of the Collaborative International Dictionary of English
- n. Astrology.
- n. The science which treats of the celestial bodies, of their magnitudes, motions, distances, periods of revolution, eclipses, constitution, physical condition, and of the causes of their various phenomena.
- n. A treatise on, or text-book of, the science.
from The Century Dictionary and Cyclopedia
- n. The science which describes the heavenly bodies and explains their apparent motions, etc.
- n. Astrological skill.
- n. Several other branches of the science are recognized: gravitational astronomy or astronomical mechanics, replacing the term physical astronomy, which is now generally discarded because of the danger of confusion with astronomical physics or astrophysics; nautical astronomy, astronomy applied to navigation; sidereal astronomy, the branch of the science which deals with the stars; spheric astronomy, which treats of the apparent position and motions of bodies on the celestial sphere; theoretical astronomy, which deals with the calculation of orbits and perturbations. These various branches interlace in all directions.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the branch of physics that studies celestial bodies and the universe as a whole
Middle English astronomie, from Old French, from Latin astronomia, from Greek astronomiā : astro-, astro- + -nomiā, -nomy.(American Heritage® Dictionary of the English Language, Fourth Edition)
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"). (Wiktionary)