- agreeable to reason; reasonable; sensible: a rational plan for economic development.
- having or exercising reason, sound judgment, or good sense: a calm and rational negotiator.
- being in or characterized by full possession of one's reason; sane; lucid: The patient appeared perfectly rational.
- endowed with the faculty of reason: rational beings.
- of, relating to, or constituting reasoning powers: the rational faculty.
- proceeding or derived from reason or based on reasoning: a rational explanation.
- Mathematics.
- capable of being expressed exactly by a ratio of two integers.
- (of a function) capable of being expressed exactly by a ratio of two polynomials.
- capable of measurement in terms of the metrical unit or mora.
- using reason or logic in thinking out a problem
- in accordance with the principles of logic or reason; reasonable
- of sound mind; sane
- endowed with the capacity to reason; capable of logical thought
- expressible as a ratio of two integers or polynomials
- a rational number
