rationalism.
The theory that reason is a source of knowledge independent of and superior to sense perception.
Meaning & usage
The theory that reason is a source of knowledge independent of and superior to sense perception.
The theory that knowledge may be derived by deductions from a priori concepts (such as axioms, postulates or earlier deductions).
A view that the fundamental method for problem solving is through reason and experience rather than faith, inspiration, revelation, intuition or authority.
Elaboration of theories by use of reason alone without appeal to experience, such as in mathematical systems.
Where this word comes from
Etymology tree English rational Proto-Indo-European *-id- Proto-Indo-European *-yéti Proto-Indo-European *-idyéti Proto-Hellenic *-íd͏̌d͏̌ō Ancient Greek -ῐ́ζω (-ĭ́zō) Proto-Indo-European *-mos Proto-Indo-European *-mós Ancient Greek -μός (-mós) Ancient Greek -ισμός (-ismós)der. English -ism English rationalism From rational + -ism.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.