n. 1 the duration of a person's life. 2 the duration of a thing or its usefulness. 3 colloq. an exceptionally long time. of a lifetime such as does not occur more than once in a person's life (the chance of a lifetime; the journey of a lifetime).
LIFETIME
Meaning of LIFETIME in English
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012