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lifetime

 - 4 dictionary results

life⋅time

  [lahyf-tahym]
Use lifetime in a Sentence
–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; ME liftime. See life, time

mean life

 
–noun Physics.
1. the average time that an unstable particle or nucleus survives before it decays.
2. decay time.
Also called average life, lifetime.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To 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.

adj.  

  1. Continuing for a lifetime; lifelong.

  2. Occurring or measured over a person's active career: a lifetime batting average.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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