intuitionism

The theory that certain truths or ethical principles are known by intuition rather than reason.

The theory that external objects of perception are immediately known to be real by intuition.

The view that the subject matter of mathematics consists of the mental or symbolic constructions of mathematicians rather than independent and timeless abstractions, as is held in Platonism.

Same as intuitionalism.

An approach to mathematics/logic which avoids proof by contradiction, and which requires that, in order to prove that something exists, one must construct it.

(philosophy) the doctrine that knowledge is acquired primarily by intuition