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| the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language). |
| a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells. |
tabula rasa
(Latin: "scraped tablet," i.e., "clean slate"), in epistemology (theory of knowledge) and psychology, a supposed condition that empiricists attribute to the human mind before ideas have been imprinted on it by the reaction of the senses to the external world of objects.
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