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Definition of valence : The degree of combining power of an atom ( or radical) as shown by the number of atoms of hydrogen ( or of other monads, as chlorine, sodium, etc.) with which it will combine, or for which it can be substituted, or with which it can be compared; thus, an atom of hydrogen is a monad, and has a valence of one; the atoms of oxygen, nitrogen, and carbon are respectively dyads, triads, and tetrads, and have a valence respectively of two, three, and four.

Synonyms:

valency

Usage examples:

• This is De Valence! - "The Scottish Chiefs", Jane Porter.
• The Bishop of Valence, a prelate of the house of Savoy, and maternal uncle to the queen, was his chief minister, and employed every art to amass wealth for himself and his relations. - "The History of England, Volume I", David Hume.
• On all I am, and have, and do- heart, brain, Body and soul,- this Valence and his gifts! - "Dramatic Technique", George Pierce Baker.