类义词典是指按义索词的词典,与之相对的是按词索义的类词词典。类义词典具有鲜明的特征:以词义立目、词目下无二级词目、词条以贴切为原则、以辅助语言输出为主旨。类义词典的理论依据是语义场理论。目前英语类义词典已取得了较丰富的成果,市场上最期待的将是专为我国英语学习者编撰的英汉双语类义词典。 Categorical dictionaries refer to lexical lexicons, which in contrast to lexical lexicons. Categorical dictionaries have distinctive characteristics: they are based on the meaning of words, have no second-level lexicon under the headwords, and the terms are based on the principle of appropriateness, with the main purpose of assisting language output. The theoretical basis of the semantic dictionary is the semantic field theory. At present, the English-based dictionary has made a lot of achievements. The most anticipated market will be the English-Chinese bilingual dictionary compiled specifically for English learners in our country.