Definition of function

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functional >

func·tion    (fngkshn) KEY 

NOUN:

1. The action for which a person or thing is particularly fitted or employed.
2. 1. Assigned duty or activity.
   2. A specific occupation or role: in my function as chief editor.
3. An official ceremony or a formal social occasion.
4. Something closely related to another thing and dependent on it for its existence, value, or significance: Growth is a function of nutrition.
5. Abbr. f Mathematics
   1. A variable so related to another that for each value assumed by one there is a value determined for the other.
   2. A rule of correspondence between two sets such that there is a unique element in the second set assigned to each element in the first set.
6. Biology The physiological activity of an organ or body part.
7. Chemistry The characteristic behavior of a chemical compound, resulting from the presence of a specific functional group.
8. Computer Science A procedure within an application.

intr.v.
func·tioned, func·tion·ing, func·tions

To have or perform a function; serve: functioned as ambassador.

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ETYMOLOGY:
Latin fncti, fnctin-, performance, execution, from fnctus, past participle of fung, to perform, execute

OTHER FORMS:
function·less(Adjective)

SYNONYMS:
function, duty, office, role

These nouns denote the actions and activities assigned to, required of, or expected of a person: the function of a teacher; a bank clerk's duty; assumed the office of financial adviser; the role of a parent.