Is it ensure, insure, or assure?
early 14c., "formal inspection or survey" (of land); mid-14c., "visual perception," from Anglo-French vewe "view," from Old French veue, noun use of fem. past participle of veoir "to see," from Latin videre "to see" (see vision). Sense of "manner of regarding something" first recorded early 15c. Meaning "sight or prospect of a landscape, etc." is recorded from c.1600.