life time


the time that the life of someone or something continues; the term of a life: peace within our lifetime.
Physics. mean life.
for the duration of a person's life: He has a lifetime membership in the organization.

1175–1225; Middle English liftime. See life, time Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lifetime (ˈlaɪfˌtaɪm)
1.  a.  the length of time a person or animal is alive
 b.  (as modifier): a lifetime supply
2.  the length of time that something functions, is useful, etc
3.  physics the average time of existence of an unstable or reactive entity, such as a nucleus, excited state, elementary particle, etc; mean life

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

early 13c., from life + time. One word from 19c.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

lifetime life·time (līf'tīm')

  1. The period of time during which an individual is alive.

  2. The period of time during which property, an object, a process, or a phenomenon exists or functions.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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