function UK /ˈfʌŋ(k)ʃən/US /ˈfʌŋkʃən/noun 11verb 2forms 4 noun11 •the particular work that something is there to do •The physiological activity of an organ or body part. •The characteristic behavior of a chemical compound. •The role of a social practice in the continued existence of the group. •A relation where one thing is dependent on another for its existence, value, or significance. •A relation in which each element of the domain is associated with exactly one element of the codomain. •A routine that receives zero or more arguments and may return a result. •An official or social occasion.Our hotel is hosting a function for all the warehouse workers on the night of April 18. •(slang) A party. •Something which is dependent on or stems from another thing; a result or concomitant. •A professional or official position. verb2 •To have a function. •To carry out a function; to be in action.Although the laying workers functioned in a queenlike manner, they were unable to suppress ovarian development as effectively as the queen. — 1991 formsfunctioned · functioning · functioneth · functions