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Word: light year
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Meaning:
Noun:
- astronomy A unit of length (''abbreviation'' ly; equal to just under 10 trillion kilometres (1016 metres)) equal to the distance light travels in one year; used to measure extremely large distances.
- (''in plural '''light years'''; figurative, informal'') A very long way.
- (''in plural '''light years'''; figurative, informal, nonstandard'') A very long time.
Source: Wiktionary
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