Is it ensure, insure, or assure?
mid-14c., from Old French entencion "stretching, intensity, will, thought" (12c.), from Latin intentionem (nominative intentio) "a stretching out, straining, exertion, effort; attention," noun of action from intendere "to turn one's attention," literally "to stretch out" (see intend).
intention in·ten·tion (ĭn-těn'shən)
An aim that guides action.
The process by which or the manner in which a wound heals.