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(ethics) The position associated with Moore, that identifies ethical propositions as objectively true or false, different in content from any empirical or other kind of judgement, and known by a special faculty of ‘intuition’. Critics charge that the term explains nothing, but may merely function as a disguise for prejudice or passion.

(mathematics) The philosophy of mathematics propounded by Brouwer, although heralded in the constructivist views of the mathematicians Leopold Krönecker (1823–91), Poincaré ;, and Félix Borel (1871–1956). In reaction against mathematical Platonism, intuitionism holds that the subject-matter of mathematics is the mental constructions of mathematicians. These are thought of as actual processes that have an existence in time, and in Brouwer's thought connect with the appreciation of time and its division. It was with the development of intuitionistic logic that intuitionism took the stage as a serious rival to classical mathematics.