light year

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• Light year — Light year, Light year Light year (Astron.) 1. The distance over which light can travel in a year s time in a vacuum, 5.88 trillion miles (9.46 trillion kilometers); used as a unit in expressing stellar distances. It is more than 63,000 times as… …   The Collaborative International Dictionary of English

• Light-year — Light year, Light year Light year (Astron.) 1. The distance over which light can travel in a year s time in a vacuum, 5.88 trillion miles (9.46 trillion kilometers); used as a unit in expressing stellar distances. It is more than 63,000 times as… …   The Collaborative International Dictionary of English

• light year — also light year, lightyear, distance light travels in one year, 1888, from LIGHT (Cf. light) (n.) + YEAR (Cf. year) …   Etymology dictionary

• light year — n 1.) the distance that light travels in one year, about 9,460,000,000,000 kilometres, used for measuring distances between stars ▪ a star 3,000 light years from earth 2.) light years ahead/better etc than sth informal much more advanced, much… …   Dictionary of contemporary English

• light year — light years 1) N COUNT A light year is the distance that light travels in a year. ...a star system millions of light years away. 2) N COUNT: usu pl, N prep/adv (emphasis) You can say that two things are light years apart to emphasize a very great …   English dictionary

• light-year — [līt′yir΄] n. 1. Astron. a unit of distance equal to the distance that light travels in a vacuum in one year, c. 9,460,000,000,000 km (5,880,000,000,000 mi): abbrev. lt yr or ly: cf. PARSEC 2. a very great distance, amount of time, etc.usually… …   English World dictionary

• light year — light ,year noun 1. ) count the distance that light travels in a year, used as a unit for measuring distances in space 2. ) light years plural INFORMAL a very long way in time, distance, or quality: Her life in Hollywood was light years away from …   Usage of the words and phrases in modern English

• light-year — light′ year n. 1) astron. the distance traversed by light in one mean solar year, about 5.88 trillion mi. (9.46 trillion km): used as a unit in measuring stellar distances 2) cvb light years a) a very great distance, esp. in development or… …   From formal English to slang

• light year — ► NOUN Astronomy ▪ a unit of distance equivalent to the distance that light travels in one year, 9.4607 x 1012 km (nearly 6 million million miles) …   English terms dictionary

• Light-year — For other uses, see Light year (disambiguation). Image showing the scale of a light year (outer shell) and a light month (inner shell) surrounding the Sun compared to Comet 1910 A1 s orbit (yellow line) and Comet Hyakutake s orbit (orange line).… …   Wikipedia

• light-year — noun the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers • Syn: ↑light year • Hypernyms: ↑astronomy unit • Part Meronyms: ↑light hour, ↑light minute, ↑light second …   Useful english dictionary