Pronunciation (UK) IPA (key): /lefˈten.ənt/ (US) IPA (key): /luːˈten.ənt/ Audio (UK)(file) Audio (US)(file) Noun Singular lieutenant Plural lieutenants (countable) A lieutenant is (the title of) an officer of middle rank in the armed forces. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads