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).

Definition of valency in:

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Word of the day apposite
Pronunciation: ˈapəzit
adjective
apt in the circumstances or relation to something