functional

The definition of functional is something that is useful for its intended purpose.

(adjective)

A saw that works to cut things is an example of a functional saw.

See functional in Webster's New World College Dictionary

adjective

of or relating to a function or functions
1. performing or able to perform a function
2. useful or intended to be useful
Med. affecting a function of some organ without apparent structural or organic changes: a functional disease

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See functional in American Heritage Dictionary 4

adjective

a. Of or relating to a function.
b. Of, relating to, or indicating a mathematical function or functions.
Designed for or adapted to a particular function or use: functional architecture.
Capable of performing; operative: a functional set of brakes.
Pathology Involving functions rather than a physiological or structural cause.

noun

A linear function on vectors whose values are scalars.

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