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Noun valency has 3 senses
  1. valency - the phenomenon of forming chemical bonds
    --1 is a kind of
    chemical phenomenon
  2. valence, valency - (biology) a relative capacity to unite or react or interact as with antigens or a biological substrate
    --2 is a kind of power, powerfulness
  3. valence, valency - (chemistry) a property of atoms or radicals; their combining power given in terms of the number of hydrogen atoms (or the equivalent)
    --3 is a kind of power, powerfulness
    --3 has particulars: covalence, covalency
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