intelligence activities concerned with identifying and counteracting the threat to security posed by hostile intelligence organizations or by individuals engaged in espionage or sabotage or subversion or terrorism
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"
what something is used for; "the function of an auger is to bore holes"; "ballet is beautiful but what use is it?"
a formal or official social gathering or ceremony; "it was a black-tie 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"
a mathematical relation such that each element of one set is associated with at least one element of another set
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"
the act of communicating with a deity (especially as a petition or in adoration or contrition or thanksgiving); "the priest sank to his knees in prayer"