1. Claude A·dri·en [klawd ey-dree-uh n; French klohd a-dree-ahn] /klɔd ˈeɪ dri ən; French kloʊd a driˈɑ̃/, 1715–71, French philosopher.


  1. Claude Adrien (klod adriɛ̃). 1715–71, French philosopher. In his chief work De l’Esprit (1758), he asserted that the mainspring of human action is self-interest and that differences in human intellects are due only to differences in education

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