Word: approximate
To estimate.
To come near to; to approach.
To carry or advance near; to cause to approach.
Approaching; proximate; nearly resembling.
Nearing correctness; nearly exact; not perfectly accurate. Example: NASA's Genesis spacecraft has on board an ion monitor to record the speed, density, temperature and approximate composition of the solar wind ions.
You can find a list of possible crossword clues for APPROXIMATE below.