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.

plural of ratio decidendi

(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.

(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.

Alternative form of K-ration

Contrary to reason; lacking an appropriate or sufficient reason; irrational. / Lacking the ability to reason.

plural of rational function

(US, military) An individual canned, precooked, or prepared wet ration formerly issued to land forces in the US military.

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