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three的序數(shù)詞是third。序數(shù)詞指的是表示順序的數(shù)詞，如first、second、fourth、fifth、sixth、seventh、eighth等。

序數(shù)詞1-10：first、second、third、fourth、fifth、sixth、seventh、eighth、ninth、tenth；11-20：eleventh、twelfth、thirteenth、fourteenth、fifteenth、sixteenth、seventeenth、eighteenth、nineteenth、twentieth；21-30：twenty-first、twenty-second、twenty-third、twenty-fourth、twenty-fifth、twenty-sixth、twenty-seventh、twenty-eighth、twenty-ninth、thirtieth。