 functions - meaning and definition. What is functions
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# What (who) is functions - definition

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Functions; Function (disambiguation); Functionality; Function definition

function
1. <mathematics> (Or "map", "mapping") If D and C are sets (the domain and codomain) then a function f from D to C, normally written "f : D -> C" is a subset of D x C such that: 1. For each d in D there exists some c in C such that (d,c) is an element of f. I.e. the function is defined for every element of D. 2. For each d in D, c1 and c2 in C, if both (d,c1) and (d,c2) are elements of f then c1 = c2. I.e. the function is uniquely defined for every element of D. See also image, inverse, partial function. 2. <programming> Computing usage derives from the mathematical term but is much less strict. In programming (except in functional programming), a function may return different values each time it is called with the same argument values and may have side effects. A procedure is a function which returns no value but has only side-effects. The C language, for example, has no procedures, only functions. ANSI C even defines a type, void, for the result of a function that has no result. (1996-09-01)
function
n.
characteristic action
1) to fulfill, perform a function
2) a grammatical function
3) the bodily functions
mathematical correspondence
4) an exponential; inverse; linear; trigonometric function
social event
5) to attend a function
6) an annual; social function
function
¦ noun
1. an activity that is natural to or the purpose of a person or thing.
a computer operation corresponding to a single instruction from the user.
2. a large or formal social event or ceremony.
3. Mathematics a relation or expression involving one or more variables.
a variable quantity regarded as depending on another variable.
4. a thing dependent on another factor or factors.
5. Chemistry a functional group.
¦ verb work or operate in a proper or particular way.
?(function as) fulfil the purpose or task of (a specified thing).
Derivatives