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English definition of “valency”

valency

noun [C] uk   /ˈveɪ.lən.si/ (also valence) specialized us  
a measurement that shows the number of hydrogen atoms that can combine with one atom of a particular chemical element to make a compound, used to describe how easily an element can connect in a chemical way with others: Zinc has a valency of 2.
(Definition of valency from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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