Is it ensure, insure, or assure?
unction unc·tion (ŭngk'shən)
The action of applying or rubbing with an ointment or oil.
(1 John 2:20,27; R.V., "anointing"). Kings, prophets, and priests were anointed, in token of receiving divine grace. All believers are, in a secondary sense, what Christ was in a primary sense, "the Lord's anointed."
ritual application of oil or fat to the head or body of a person or to an object; an almost universal practice in the history of religions, although both the cultic practice followed and the sacred substance employed vary from one religion to another. It is possible to recognize three distinct, though not separate, meanings ascribed to ritual anointments by the devotees of various religions