EXTREMUM Meaning of EXTREMUM in English [ ɪk'stri:məm , ɛk- ]■ noun ( plural ~s or extrema ) Mathematics the maximum or minimum value of a function.Originearly 20th cent.: from L., neut. of extremus (see extreme ). Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004