Definition of valency in English:

valency

Syllabification: va·len·cy
Pronunciation: /ˈvālənsē
 
/

noun (plural valencies)

Chemistry & Linguistics, chiefly British
another term for valence1.

Origin

early 17th century: from late Latin valentia 'power' (see valence1).

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Word of the day erroneous
Pronunciation: ɪˈrəʊnɪəs
adjective
wrong; incorrect