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Adjective: bivalent  bI'vey-lunt
  1. (chemistry) having a valence of two or having two valences
    "This can be explained by a lower total coordination of the bivalent atoms";
    - divalent
     
  2. (genetics) used of homologous chromosomes associated in pairs in synapsis
    - double

See also: valence, valency

Antonym: multivalent, univalent

Encyclopedia: Bivalent