Definitions from Wiktionary ( )

▸ adjective:  Capable of reasoning.
▸ adjective:  Logically sound; not self-contradictory or otherwise absurd.
▸ adjective:  (of a person or personal characteristics) Healthy or balanced intellectually; exhibiting reasonableness.
▸ adjective:  (mathematics, not comparable) Comprising, or expressible as, a ratio
▸ adjective:  (arithmetic) Of a number, capable of being expressed as the ratio of two integers.
▸ adjective:  (algebra) Of an algebraic expression in indeterminates, or more generally a function: capable of being expressed as the ratio of two polynomials.
▸ adjective:  (algebraic geometry) Of a variety: (informally) geometrically simple almost everywhere; (formally) birationally equivalent to projective space
▸ adjective:  (algebraic geometry) Of a function between varieties: acting as a morphism on an open subset of its domain.
▸ adjective:  (algebraic geometry) 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).
▸ adjective:  (chemistry) Expressing the type, structure, relations, and reactions of a compound; graphic; said of formulae.
▸ adjective:  (physics) Expressing a physical object.
▸ noun:  (mathematics) A rational number: a number that can be expressed as the quotient of two integers.
▸ noun:  (historical) The breastplate worn by Israelite high priests.

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