Etymology
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lifetime (n.)

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

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Definitions of lifetime

lifetime (n.)
the period during which something is functional (as between birth and death);
Synonyms: life / life-time / lifespan
From wordnet.princeton.edu