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Synonyms for Multivalent (same or very similar meaning)

WordNet sense 1 (having more than one valence, or having a valence of 3 or higher):
polyvalent

WordNet sense 2 (having many values, meanings, or appeals):
multi-valued

WordNet sense 3 (having more than one possible meaning):
ambiguous


From the ODE community, based on WordNetadd/edit