functionalism functional • functionalist · · · Info · Definitions · Characters · · functionalism · · Text Latin · · Script 13 · · Length Definitions · · · (noun) a psychology based on the assumption that all mental process are useful to an organism in adapting to the environment. · · Noun Definition 1 (noun) any doctrine that stresses utility or purpose. · · Noun Definition 2 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 f latin small letter f U+0066 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075