the doctrine that the meaning of a scientific term, concept, or proposition consists of the operation or operations performed in defining or demonstrating it.
op·er·a·tion·al·ism (ŏp'ə-rā'shə-nə-lĭz'əm) n.
Philosophy The view that all theoretical terms in science must be defined only by their procedures or operations. op'er·a'tion·al·ist n.