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lifetime

[lahyf-tahym] /ˈlaɪfˌtaɪm/
noun
1.
the time that the life of someone or something continues; the term of a life:
peace within our lifetime.
2.
Physics. mean life.
adjective
3.
for the duration of a person's life:
He has a lifetime membership in the organization.
Origin
1175-1225
1175-1225; Middle English liftime. See life, time
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for life time

lifetime

/ˈlaɪfˌtaɪm/
noun
1.
  1. the length of time a person or animal is alive
  2. (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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for life time

lifetime

n.

also life-time, early 13c., from life (n.) + time (n.). One word from 19c. Old English had lifdæg in same sense, literally "life day."

Online Etymology Dictionary, © 2010 Douglas Harper
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life time in Medicine

lifetime life·time (līf'tīm')
n.

  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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