Other spellings coworker Word parts co- + worker Pronunciation (US) IPA (key): /ˈkoʊˈwɝ.kɚ/ (UK) IPA (key): /ˈkəʊˈwɜː.kə/ Audio (US)(file) Hyphenation: co‧wor‧ker Noun Singular co-worker Plural co-workers (countable) A co-worker is someone a person works with. Synonym: colleague Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads