Pronunciation (UK) IPA (key): /ˈkɜːnəl/ (US) IPA (key): /ˈkɝnəl/ Audio (US)(file) Audio (US)(file) Homophone: kernel Noun Singular colonel Plural colonels (countable) A colonel is a rank of an officer in the army. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads