lifetime

[ lahyf-tahym ]
/ ˈlaɪfˌtaɪm /

noun

the time that the life of someone or something continues; the term of a life: peace within our lifetime.
Physics. mean life.

adjective

for the duration of a person's life: He has a lifetime membership in the organization.

Origin of lifetime

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

Example sentences from the Web for lifetime

British Dictionary definitions for lifetime

lifetime
/ (ˈlaɪfˌtaɪm) /

noun

  1. the length of time a person or animal is alive
  2. (as modifier)a lifetime supply
the length of time that something functions, is useful, etc
physics the average time of existence of an unstable or reactive entity, such as a nucleus, excited state, elementary particle, etc; mean life

Medical definitions for lifetime

lifetime
[ līftīm′ ]

n.

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