verb

1. To estimate.

2. To come near to; to approach.

3. To carry or advance near; to cause to approach.

adjective

1. Approaching; proximate; nearly resembling.

2. Nearing correctness; nearly exact; not perfectly accurate.

   “NASA's Genesis spacecraft has on board an ion monitor to record the speed, density, temperature and approximate composition of the solar wind ions.”

Synonyms: close