rational.
Capable of reasoning.
Meaning & usage
Capable of reasoning.
Man is a rational creature.
Capable of reasoning. Behaving according to some partial order of preferences.
Logically sound; not self-contradictory or otherwise absurd.
His statements were quite rational.
Healthy or balanced intellectually; exhibiting reasonableness.
rational conduct
Comprising, or expressible as, a ratio Of a number, capable of being expressed as the ratio of two integers.
Comprising, or expressible as, a ratio Of an algebraic expression in indeterminates, or more generally a function: capable of being expressed as the ratio of two polynomials.
Comprising, or expressible as, a ratio Of a variety: (informally) geometrically simple almost everywhere; (formally) birationally equivalent to projective space
Comprising, or expressible as, a ratio Of a function between varieties: acting as a morphism on an open subset of its domain.
Comprising, or expressible as, a ratio Of a point on an algebraic variety over a field: whose coordinates belong to the field in question (in contrast to those points of the variety which are only defined over the algebraic closure of the base field).
synonymous replacement for "condensed" in condensed formula.
Where this word comes from
From Old French rationel, rational, from Latin rationalis (“of or belonging to reason, rational, reasonable; having a ratio”), from ratio (“reason; calculation”).
A rational number: a number that can be expressed as the quotient of two integers.
The quotient of two rationals is again a rational.
Where this word comes from
From Old French rationel, rational, from Latin rationalis (“of or belonging to reason, rational, reasonable; having a ratio”), from ratio (“reason; calculation”).
The breastplate worn by Israelite high priests.
Where this word comes from
From Old French rational, from Medieval Latin rationale (“a pontifical stole, a pallium, an ornament worn over the chasuble”), neuter of Latin rationalis (“rational”), for which see the first etymology. Translation of λογεῖον (logeîon) or perhaps λόγιον (lógion, “oracle”) in the Septuagint version of Exodus 28.
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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.