(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.

an advocate of rational egoism

(philosophy) The doctrine that it is rational to act in one's own self-interest. / (philosophy) A theory espoused by Ayn Rand, combining this doctrine with ethical egoism.

(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).

(philosophy) A specific form of rationality focusing on the most efficient or cost-effective means to achieve a specific end, but not in itself reflecting on the value of that end.

(philosophy) The proposition that scientific theories, and any other claims to knowledge, can and should be rationally criticized, and, if they have empirical content, can and should be subjected to tests which may falsify them.

An individual daily combat food ration introduced by the United States Army during World War II and comprising three courses for breakfast, lunch and supper.

(chiefly Australia) Synonym of neoliberalism. / Used other than figuratively or idiomatically: see economic, rationalism.

Synonym of rational egoism (“theory espoused by Ayn Rand”)

plural of iron ration