approximate (adj.) Look up approximate at Dictionary.com
"near in position, close to," 1640s, from Late Latin approximatus, past participle of approximare "to come near to," from Latin ad "to" (see ad-) + proximare "come near," from proximus "nearest," superlative of prope "near" (see propinquity). Meaning "near in accuracy or correctness" is by 1816. Also used in Middle English in a sense "similar" (early 15c.).
approximate (v.) Look up approximate at Dictionary.com
early 15c., "to bring or put close," from Late Latin approximatus, past participle of approximare "to come near to," from Latin ad "to" (see ad-) + proximare "come near," from proximus "nearest," superlative of prope "near" (see propinquity). Intransitive meaning "to come close" is from 1789. Related: Approximated; approximating.