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From The Collaborative International Dictionary of English v.0.48:
Quadrivalent \Quad*riv"a*lent\, a. [Quadri- + L. valens, -entis, p. pr. See Valence.] (Chem.) Having a valence of four; capable of combining with, being replaced by, or compared with, four monad atoms; tetravalent; -- said of certain atoms and radicals; thus, carbon and silicon are quadrivalent elements. [1913 Webster]