as required

a light-tight supply chamber holding the film and supplying it for exposure as required n

marriage within one's own tribe or group as required by custom or law

marriage to a person belonging to a tribe or group other than your own as required by custom or law

change the form of a word in accordance as required by the grammatical rules of the language

v change the form of a word in accordance as required by the grammatical rules of the language v vary the pitch of one's speech