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1. Chemistry Having valence 3.
2. Immunology
a. Having three sites of attachment. Used of an antibody or antigen.
b. Containing antigens from three strains of a microorganism or virus. Used of a vaccine or serum.

tri·va′lence, tri·va′len·cy n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
Depending on the proportion of Al that is soluble, and the proportion occurring as inorganic and organic complexes, the assumption of trivalence of Al in soil extracts might result in an overestimate of the Al on the effective cation exchange capacity (ECEC).
Thanks to trivalence, the proposal of Horgan and Timmons assigns distinct states to Marie in ~w, w~, and N.