(mathematics) The systematic study of the situation of maps' having a homotopy between them; the study of equivalence classes (called homotopy classes) of maps.

(economics) The economy theory based around the cobweb model.

The theory that people who are regularly exposed to mass media eventually come to perceive the world's social realities as presented by the media, affecting their attitudes and behaviours.

A scientific theory that has been disproved, or for which attempts to prove it have failed, but which continues to be presented as a viable theory.

(complex analysis, differential geometry) A geometric counterpart to Nevanlinna theory that extends the applicability of the concept of covering surface (of a topological space) by defining a covering number (a generalised "degree of covering") applicable to any bordered Riemann surface equipped with a conformal Riemannian metric.

(cricket, dated) The tactic of bowling at or near the line of leg stump, so as to cramp the batsman.

Any of various theories of human motivation built on Douglas McGregor's Theory X and Theory Y.

(sociology) An ontological framework developed by Gilles Deleuze and Félix Guattari for the analysis of social complexity by emphasizing fluidity, exchangeability, and multiple functionalities.

(US politics, historical) An element of U.S. President Richard Nixon's foreign policy, by which Nixon was portrayed as irrational and volatile toward leaders of hostile Communist nations, with the aim of making them fearful of provoking the United States.

(construction) A theory describing the behaviour of a beam, plate, or shell consisting of three layers: two facesheets and one core.