Inflected forms: pl. lon·gev·i·ties 1a. Long life; great duration of life: His longevity vexed his heirs.b. Length or duration of life: comparing the longevities of the two peoples.2. Long duration or continuance, as in an occupation: had unusual longevity in the company; her longevity as a star.
ETYMOLOGY:
Late Latin longaevits, from Latin longaevus, ancient : longus, long; see del-1 in Appendix I + aevum, age; see aiw- in Appendix I.