What does approximate mean?
The definition of approximate
Ap*prox”i*mate, a.
Etym: [L. approximatus, p. p. of approximare to approach; ad + proximare to come near. See Proximate.]

1 Approaching; proximate; nearly resembling.
2 Near correctness; nearly exact; not perfectly accurate; as, approximate results or values. Approximate quantities (Math.), those which are nearly, but not, equal.

Ap*prox”i*mate, v. t.
[imp. & p. p. Approximated; p. pr. & vb. n. Approximating.]

1 To carry or advance near; to cause to approach. To approximate the inequality of riches to the level of nature. Burke.
2 To come near to; to approach. The telescope approximates perfection. J. Morse.

Ap*prox”i*mate, v. i.
To draw; to approach.