approximate
verb
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To estimate.
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To come near to; to approach.
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To carry or advance near; to cause to approach.
adjective
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Approaching; proximate; nearly resembling.
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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
Antonyms:
exact, precise