accidence /'aeksidans; 'aeksadans/ n [U] (gram) that part of grammar which deals with meaningful differences in the form of a word, eg have, has, had; foot, feet, etc. The more usu term is now morphology. (文法) 語(yǔ)形變化; 字形變化 (如 have, has, had; foot, feet 等; 今較常用 morphology)。 → syntax.