(industrial relations) Any of a set of rules aimed at resolving conflicts among trade unions.

(fluid dynamics) A law that states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially, is equal to the weight of the fluid that the body displaces.

In the neo-Gricean semantics and pragmatics of Laurence R. Horn: a reformulation of Paul Grice's maxim of relation combined with the second submaxim of quantity and the third and fourth submaxims of manner, stating: "Say no more than you must (given Q)", and implying that there is no reason to make a stronger statement if the extra information can be contributed by implicature.

In the neo-Gricean semantics and pragmatics of Laurence R. Horn: a reformulation of Paul Grice's maxim of quantity combined with the first two submaxims of manner, stating: "Say as much as you can (given R)", and leading to the implicature that if the speaker did not make a stronger statement (or say more), then its denial is (implied to be) true.

(geometry) A development of the method of indivisibles, dealing with two-dimensional area or three-dimensional volume based on the intersections of lines or planes surrounding a region. It was an early step toward integral calculus.

plural of reciprocity principle

A principle stating that the most effective design for a product is one that is "Most Advanced, Yet Acceptable", or one that combines familiarity and novelty.

Alternative form of non-aggression principle

(physics) The principle that a volume is a boundary of a higher-dimension region

A concept in the management of protected landscapes in the United Kingdom, where the need for conservation is balanced with access to the public.