valency
noun [countable, uncountable](plural valencies)
- (
chemistry 化學 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 價；化合價；原子價 - (
linguistics 語言學 the number of grammatical elements that a word, especially a verb, combines with in a sentence 組配數限，配價（一個詞，尤指動詞，在句子中結合的語法成分的數目）
Word Originearly 17th cent.: from late Latin valentia ‘power, competence’, from valere ‘be well or strong’.