(dated) To execute or perform a function; to transact one's regular or appointed business.

(mathematics) A function that takes a function as its argument; More precisely: A function y=f(x) whose argument x varies in a space of (real or complex valued) functions and whose value belongs to a monodimensional space. An example is the definite integration of integrable real functions in a real interval.

(uncountable) The ability to do a task, performance, or execution; a set of functions that something is able or equipped to perform.

(intransitive) To have a function. / (intransitive) To carry out a function; to be in action.

simple past tense and past participle of function

(architecture) A doctrine, in several fields, that the function of something should be reflected in its design and the materials used in its construction

present participle of function

Functional, working / (euphemistic, of a person) Mentally disabled but still able to survive in wider society.

Action of the verb function. / Manner by which something functions; the workings.

Third-person singular simple present indicative form of function