valency
noun [countable, uncountable](plural valencies)
- (
chemistry 化学 a measurement of the power of an atom to combine with others, by the number of atoms of hydrogen it can combine with or displace 价；化合价；原子价 - (
linguistics 语言学 the number of grammatical elements that a word, especially a verb, combines with in a sentence 组配数限，配价（一个词，尤指动词，在句子中结合的语法成分的数目）
Word Originearly 17th cent.: from late Latin valentia ‘power, competence’, from valere ‘be well or strong’.