Word Type

Adjective

Adjective

Noun

The word "rational" can be used as adjective, adjective and noun.

Word Relationships

Opposites (Antonyms)

absurd arational irrational irrational

Derived Terms

Ratfor antirational biorational birational contrarational extrarational hyperrational nonrational overrational prerational preterrational pseudorational rational basis review rational choice theory rational dress rational egoism rational egoist rational function rational horizon rational numbers rational root theorem rational selfishness rational symptom rationalisation rationalism rationalist rationalistic rationalization rationally semirational superrational transrational ultrarational unirational unrational

Context

arithmetic chemistry historical mathematics number theory physics

Broader Terms (Hypernyms)

real real number

Related Terms

arational irrational non-rational rationale rationality rationalness subrational suprarational

Related Terms

absurd algebraic arational balance breastplate compound contradictory formula graphic healthy integer intellect irrational logical non rational number object physical polynomial quotient ratio rational number rationale rationality rationalness reasonable reasonableness reasoning sane sound subrational suprarational

Similar Terms

coherent consistent demythologised demythologised demythologized intellectual intellectual intelligent intelligent logical lucid lucid mental ordered reasonable reasonable reasoning sane sensible thinking

Synonym Network

noetic rational number reasonable

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.