/lon jev"i tee, lawn-/ , 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.
[ 1605-15; longaevitas. See LONGEVOUS, -ITY ]