experiˈentialismn. the theory or doctrine that all knowledge is derived from experience.
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the world > action or operation > endeavour > trial or experiment > [noun] > empiricism
empiricism1796
experimentalisma1834
experientialism1865
1865 D. MassonRecent Brit. Philos. 37 As Mr. Mill has used the adjective ‘Experiential’..perhaps the substantive Experientialism..might be brought into use.