rational

Fetched 2026-10-27 (live).

Synonyms: national, arational, rationale, irrational, notional, relational, optional, regional, fractional, matinal, atonal

Antonyms: national, arational, rationale, irrational, notional, relational, optional, regional, fractional, matinal, atonal

Related words from Datamuse; suggestions, not definitions.

Adjective

Capable of reasoning.
- Man is a rational creature.
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.
- ¾ is a rational number, but √2 is an irrational number.
Of a number, capable of being expressed as the ratio of two integers.
- ¾ is a rational number, but √2 is an irrational number.
Of an algebraic expression in indeterminates, or more generally a function: capable of being expressed as the ratio of two polynomials.
Of a variety: (informally) geometrically simple almost everywhere; (formally) birationally equivalent to projective space
Of a function between varieties: acting as a morphism on an open subset of its domain.
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.

A rational number: a number that can be expressed as the quotient of two integers.
- The quotient of two rationals is again a rational.

Source: Wiktionary · CC BY-SA 3.0 (Wiktionary) · cached copy, not a rewrite.