词项通常为逻辑学术语，你可以百度一下了解其定义和英文术语。英语语法书中所说的词项指的是 lexical items。其定义为：A lexical item is a single word, a part of a word, or a chain of words (catena) that forms the basic elements of a language's lexicon (≈ vocabulary). Examples are cat, traffic light, take care of, by the way, and it's raining cats and dogs. Lexical items can be generally understood to convey a single meaning, much as a lexeme, but are not limited to single words.