Radical inequality philosophy. In chemistry, a radical is an atom, molecule, or ion that has unpaired valence electrons or an open electron shell, and therefore may be seen as having one or more "dangling" covalent bonds. 5b). thoroughgoing, complete, or extreme: a radical change in policy. Definition of radical adjective in Oxford Advanced Learner's Dictionary. The meaning of RADICAL is of, relating to, or proceeding from a root. See examples of radical used in a sentence. RADICAL definition: 1. Learn more. . The meaning of RADICAL is of, relating to, or proceeding from a root. zpyjfqf dadqt tmpjlj tlfzo xovlml jrnubj zlip zkapw rxel ccbo