(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

plural of functionality

(logic, mathematics) A function that is equivalent to the NOT operator.

plural of functional

plural of functionalism

In a functional manner.