1
a
: a doctrine that mind is the fundamental reality : berkeleianism compare idealism, materialism
b
: a doctrine that distinguishes mental processes fundamentally from the accompanying brain activity
2
: a view that conscious processes as revealed by introspection are the proper data of psychology
—opposed to behaviorism
3
: a hypothesis that special factors of mind must be assumed to analyze, classify, or explain some or all phenomena of language compare mechanism
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Merriam-Webster unabridged