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valence (n.)

early 15c., "extract, preparation," from Latin valentia "strength, capacity," from valentem (nominative valens) "strong, stout, vigorous, powerful," present participle of valere "be strong" (from PIE root *wal- "to be strong"). Chemistry sense of "relative combining capacity of an element with other atoms when forming compounds or molecules" is recorded from 1884, from German Valenz (1868), from the Latin word. Related: Valency.

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Definitions of valence from WordNet

valence (n.)
(biology) a relative capacity to unite or react or interact as with antigens or a biological substrate;
Synonyms: valency
valence (n.)
(chemistry) a property of atoms or radicals; their combining power given in terms of the number of hydrogen atoms (or the equivalent);
Synonyms: valency
From wordnet.princeton.edu