FUNCTIONALISM /ˈfʌŋkʃənəlɪzəm/ Scrabble 20 Words With Friends 26 Definition noun a psychology based on the assumption that all mental process are useful to an organism in adapting to the environment. noun any doctrine that stresses utility or purpose. See all 1190 words you can make from FUNCTIONALISM → 13-letter words Words starting with F Words ending with M ← Unscramble different letters