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From The Collaborative International Dictionary of English v.0.48:
Univalent \U*niv"a*lent\, a. [Uni- + L. valens, -entis, p. pr. See Valence.] (Chem.) Having a valence of one; capable of combining with, or of being substituted for, one atom of hydrogen; monovalent; -- said of certain atoms and radicals. [1913 Webster]