Added 10 October 2026 coworker /ˌkəʊˈwɜː.kər/ noun Categories: Rare Words noun ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about coworker at Wordnik → Where our words come from → Somebody with whom one works. He heard from a coworker that the company planned to merge those departments. A person in the lowest common denominator, especially regarding popular culture. This is the most coworker movie I've ever seen. Related Words: co-workercolleaguecollaboratorassistantemployeecontributorfellowpartnerworkmateworkpersonex-workerteamworker Back to today's word