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Image functions.jpg




1. the kind of action or activity proper to a person, thing, or institution; the purpose for which something is designed or exists; role.

2. any ceremonious public or social gathering or occasion.

3. a factor related to or dependent upon other factors: Price is a function of supply and demand.

For lessons on the topic of Function, follow this link.

4. Mathematics.

a. Also called correspondence, map, mapping, transformation. a relation between two sets in which one element of the second set is assigned to each element of the first set, as the expression y = x2; operator.
b. Also called multiple-value function. a relation between two sets in which two or more elements of the second set are assigned to each element of the first set, as y2 = x2, which assigns to every x the two values y = +x and y = −x.
c. a set of ordered pairs in which none of the first elements of the pairs appears twice.

5. Geometry.

a. a formula expressing a relation between the angles of a triangle and its sides, as sine or cosine.
b. hyperbolic function.

6. Grammar.

a. the grammatical role a linguistic form has or the position it occupies in a particular construction.
b. the grammatical roles or the positions of a linguistic form or form class collectively.

7. Sociology. the contribution made by a sociocultural phenomenon to an ongoing social system. –verb (used without object)

8. to perform a specified action or activity; work; operate: The computer isn't functioning now. He rarely functions before noon.

9. to have or exercise a function; serve: In earlier English the present tense often functioned as a future. This orange crate can function as a chair.


1525–35; < L functiōn- (s. of functiō) a performance, execution, equiv. to funct(us) (ptp. of fungī) performed, executed + -iōn