I. ˈfəŋ(k)tə(r) noun
( -s )
Etymology: New Latin, from Latin functus (past participle of fungi to perform) + New Latin -or — more at function
1. : something that performs a function or operation
2. : a sign for a nonpropositional function ; especially : a syncategorematic sign used to indicate operations in symbolic logic
• func·to·ri·al |fəŋ(k)|tōrēəl adjective
II. noun
1. : function word
2. : a rule defined on two mathematical categories that assigns each object and mapping of one category to an object and mapping of the other in such a way as to preserve certain aspects of structure (as identity mappings, composition of mappings, and isomorphism)