Meaning of VALENCY in English

VALENCY

/ ˈveɪlənsi; NAmE / noun [ C , U ] ( pl. -ies ) (also va·lence / ˈveɪləns; NAmE / especially in NAmE )

1.

( chemistry ) a measurement of the power of an atom to combine with others, by the number of hydrogen atoms it can combine with or displace :

Carbon has a valency of 4.

2.

( linguistics ) the number of grammatical elements that a word, especially a verb, combines with in a sentence

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WORD ORIGIN

early 17th cent.: from late Latin valentia power, competence, from valere be well or strong.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.