a the length of time a person or animal is alive
b (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 or elementary particle, etc.; mean life
English Collins Dictionary - English Definition & Thesaurus
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"