(mathematics, physics) The principle that a linear combination of two or more solutions of an equation is itself a solution; it is a feature of many physical laws

(philosophy) Synonym of verifiability principle

(philosophy) Synonym of verifiability principle

(philosophy) Synonym of verifiability principle

(philosophy) The principle, especially in 20th-century empiricism, that a statement has meaning if, and only if, either it can be verified by means of empirical observations or it is logically true by definition.

(logic) The principle or axiom of classical logic and some other logical systems stating that if a contradiction or a false proposition is proven to be true, then it proves that everything is true. In symbols: ⊥→P

(psychology, psychoanalysis, Freudianism, often hyphenated when used attributively) The mental mechanism which guides a person, as he or she matures, in adapting to and coping with the real, external world, by suppressing or deferring the childish gratification-seeking desires of the id.

(psychology, psychoanalysis, Freudianism, often hyphenated when used attributively) The principle that human decisions and behavior are strongly motivated by the instinctual desire of the id, arising in infancy, to experience pleasure and avoid pain.

The claim that something good will turn up, especially when used to justify optimism. / The claim that financial surplus is success and debt is failure.

(linguistics) The idea of using ideograms as phonograms representing the sounds of the words expressed by the original ideograms.