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Adjective: monovalent  ,mó-now'vey-lunt
  1. (chemistry) having a valence of 1
    "Sodium is a monovalent element";
    - univalent
     
  2. (immunology) containing only one kind of antibody
    "The monovalent vaccine targets a single strain of the virus"

See also: valence, valency

Antonym: multivalent, polyvalent

Encyclopedia: Monovalent