(archaic) The quality or state of being rational.

plural of rationalizing

(now rare) Rationally, reasonably.

rationing

plural of rationalization hamster

(informal, derogatory) A notional intracranial hamster representing the circular thought processes used to continuously justify one's own actions and beliefs.

(mathematics) A number that can be expressed as the ratio of two integers.

plural of rational number

(mathematics) The set of numbers that can be expressed as a ratio of integers, often denoted with the bold letter Q, or the blackboard bold letter ℚ.

(mathematics, complex analysis, algebraic geometry) Any function expressible as the quotient of two (coprime) polynomials (and which thus has poles at a finite, discrete set of points which are the roots of the denominator).