1. (noun) function, mathematical function, single-valued function, map, mapping
(mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function)
2. (noun) function, purpose, role, use
what something is used for
"the function of an auger is to bore holes"; "ballet is beautiful but what use is it?"
3. (noun) function, office, part, role
the actions and activities assigned to or required or expected of a person or group
"the function of a teacher"; "the government must do its part"; "play its role"
4. (noun) function
a relation such that one thing is dependent on another
"height is a function of age"; "price is a function of supply and demand"
5. (noun) function
a formal or official social gathering or ceremony
"it was a black-tie function"
6. (noun) affair, occasion, social occasion, function, social function
a vaguely specified social event
"the party was quite an affair"; "an occasion arranged to honor the president"; "a seemingly endless round of social functions"
7. (verb) routine, subroutine, subprogram, procedure, function
a set sequence of steps, part of larger computer program
8. (verb) function, work, operate, go, run
perform as expected when applied
"The washing machine won't go unless it's plugged in"; "Does this old car still run well?"; "This old radio doesn't work anymore"
9. (verb) serve, function
serve a purpose, role, or function
"The tree stump serves as a table"; "The female students served as a control group"; "This table would serve very well"; "His freedom served him well"; "The table functions as a desk"
10. (verb) officiate, function
perform duties attached to a particular office or place or function
"His wife officiated as his private secretary"
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Definition of 'function' 
