rationalist

Adjective
  1. Of or relating to or characteristic of rationalism (synset 302920830)
    "rationalist philosophy"
Noun
  1. Someone who emphasizes observable facts and excludes metaphysical speculation about origins or ultimate causes (synset 110475704)
    is a type of: nonreligious person - a person who does not manifest devotion to a deity
    subtypes: logical positivist - someone who maintains that any statement that cannot be verified empirically is meaningless
    same as: positivist

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