描述：Dictionary of the Amerccan Language: a word that is opposite in meaning to another word (意思与另一在词相对立的词);Longman Modern English Dictionary: a word which means the exact 'contrary of another (意思与另一个词正好相等的词);Oxford English Dictionary: a term which is the opposite or antithesis of another, a counter term (与另一个词意相反或对立的词,