Etymology
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bivalent (adj.)

1864, of chemicals, 1899, of chromosomes, from bi- + -valent (see valence in the chemistry sense).

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Definitions of bivalent

bivalent (adj.)
having a valence of two or having two valences;
Synonyms: divalent
bivalent (adj.)
used of homologous chromosomes associated in pairs in synapsis;
Synonyms: double
From wordnet.princeton.edu