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)

1) to fulfill, perform a function

2) a grammatical function

3) the bodily functions

4) an exponential; inverse; linear; trigonometric function

5) to attend a function

6) an annual; social 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).

C16: from Fr. *fonction*, from L. *functio(n-)*, from *fungi* 'perform'.

Pronunciation examples for functions

1. functions."

2. functions.

3. functions.

4. functions.

5. functions?

Examples of use of functions

1. Government acquires more functions because no one dares strip away any existing functions.

2. We have been following his brain and lung functions carefully and his brain functions are gradually improving,» Tosun said.

3. India‘s civilian government functions transparently and accountably.

4. "It could have implications for the way Castro functions, and by natural course, the way the Cuban government functions," the official added.

5. Accordingly, lowly functions such as washing, dressing and administering bedpans — where dignity was most fragile — were the functions that in nursing were invested with the highest possible significance.