AleutPronunciation: /əˈljuːt, ˈalɪuːt/Definition of Aleut noun 1a member of a people inhabiting the Aleutian Islands, other islands in the Bering Sea, and parts of western Alaska. 2 [mass noun] the language of the Aleuts, related to Eskimo but now almost extinct. adjective relating to the Aleuts or their language. Origin:of unknown originAleut in other Oxford dictionaries Definition of Aleut in the US English dictionary