n.
1.a mathematical relation such that each element of one set is associated with at least one element of another set
2.what something is used for
3.the actions and activities assigned to or required or expected of a person or group
4.a relation such that one thing is dependent on another
5.a formal or official social gathering or ceremony
6.a vaguely specified social event
7.a set sequence of steps, part of larger computer program function v.
1.perform as expected when applied
2.serve a purpose, role, or function
3.perform duties attached to a particular office or place or function