/ Thesaurus / L Synonyms of length of service Find synonyms for: Noun1. longevity, length of service, longnessusage: duration of service; "her longevity as a star"; "had unusual longevity in the company"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: malady Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language