Pronunciation: (in"tOO-ish'u-niz"um, -tyOO-),[key] —n. 1. Ethics.the doctrine that moral values and duties can be discerned directly.
2. Metaphys. a. the doctrine that in perception external objects are given immediately, without the intervention of a representative idea.
b. the doctrine that knowledge rests upon axiomatic truths discerned directly.
3. Logic,Math.the doctrine, propounded by L. E. J. Brouwer, that a mathematical object is considered to exist only if a method for constructing it can be given.