"positivist" in the noun sense
1. positivist, rationalist
someone who emphasizes observable facts and excludes metaphysical speculation about origins or ultimate causes
"positivist" in the adjective sense
1. positivist, positivistic, positive
of or relating to positivism
"positivist thinkers"
"positivist doctrine"
"positive philosophy"
Source: WordNet® (An amazing lexical database of English)
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