Lifetimes

lifetime

[lahyf-tahym]
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; Middle English liftime. See life, time

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World English Dictionary
lifetime (ˈlaɪfˌtaɪm)
 
n
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
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Etymonline
Word Origin & History

lifetime
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')
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
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