valence/ˈveɪləns; `veləns/ n(chemistry 化)1 [U] capacityof an atom to combine with, or be replaced by, another or others as compared with that of the hydrogen atom 化合价; 原子价 Carbon has a valence of four. 碳的化合价是四价.2 [C] (US) = valency.
牛津英汉双解词典