longevity

UK: /lɒnˈdʒɛvɪti/

US: /lɑnˈdʒɛvɪti, lɔn-/

US: (lon jev′i tē, lôn-)

WordReference Random House Learner's Dictionary of American English © 2026

lon•gev•i•ty /lɑnˈdʒɛvɪti, lɔn-/   n. [uncountable]

1. long life:
   a family known for longevity.
2. length of life:
   research in longevity.
3. length of service;
   seniority:
   promotions based on longevity.

WordReference Random House Unabridged Dictionary of American English © 2026

lon•gev•i•ty  (lon jev′i tē, lôn-), n. 

1. a long individual life;
   great duration of individual life:
   Our family is known for its longevity.
2. the length or duration of life:
   research in human longevity.
3. length of service, tenure, etc.;
   seniority:
   promotions based on longevity.

• Latin longaevitās. See longevous, -ity
• 1605–15

Collins Concise English Dictionary © HarperCollins Publishers::

longevity / lɒnˈdʒɛvɪtɪ/ noun

1. long life
2. relatively long duration of employment, service, etc

Etymology: 17th Century: from Late Latin longaevitās, from Latin longaevus long-lived, from longus long¹ + aevum age

longevous / lɒnˈdʒiːvəs/ adjective