rationalist
1. [ adjective ] (philosophy) of or relating to or characteristic of rationalism
Examples:

"rationalist philosophy"

Related terms: rationalism
2. [ noun ] (religion) someone who emphasizes observable facts and excludes metaphysical speculation about origins or ultimate causes
Synonyms: positivist
Related terms: nonreligious_person logical_positivist
Similar spelling:   rationalistic
  rational
  rationality
  rationalism
  rationalise
  rationalize
  rationale
  rationalness
  rationally