approximate (adj.) Look up approximate at Dictionary.com
early 15c., from Latin approximatus, past participle of approximare "to come near to," from ad "to" (see ad-) + proximare "come near," from proximus "nearest," superlative of prope "near" (see propinquity).
approximate (v.) Look up approximate at Dictionary.com
early 15c., "to bring or put close," from approximate (adj.). Meaning "to come close" is from 1789. Related: Approximated; approximating.