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Synonyms

lifetime

American  
[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

  1. for the duration of a person's life.

    He has a lifetime membership in the organization.
lifetime British  
/ ˈlaɪfˌtaɪm /

noun

    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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of lifetime

First recorded in 1175–1225, lifetime is from the Middle English word liftime. See life, time

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.