func·tion 
(fŭngkshən)
(fŭngkshən)n.
1. The action or purpose for which a person or thing is suited or employed, especially:
a. A person's role or occupation: in my function as chief editor.
b. Biology The physiological activity of an organ or body part: The heart's function is to pump blood.
c. Computers A procedure within an application.
2. An official ceremony or a formal social occasion: disliked attending receptions and other company functions.
3. Something closely related to another thing and dependent on it for its existence, value, or significance: Growth is a function of nutrition.
4. Abbr. f Mathematics
a. A variable so related to another that for each value assumed by one there is a value determined for the other.
b. A rule of correspondence between two sets such that there is exactly one element in the second set assigned to each element in the first set. Also called mapping.
intr.v. func·tioned, func·tion·ing, func·tions
1. To have or perform a function; serve: functioned as ambassador.
2. To deal with or overcome the challenges of everyday life: For weeks after his friend's funeral he simply could not function.
[Latin fūnctiō, fūnctiōn-, performance, execution, from fūnctus, past participle of fungī, to perform, execute.]
function·less adj.
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; performed the office of financial adviser; the role of a parent.
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; performed the office of financial adviser; the role of a parent.