十じゅう八はちCommon wordMeanings1numericeighteen; 18The number eighteen. Used for counting, ages, quantities, and in compound words.彼かれは十じゅう八はっ歳さいです。He is eighteen years old.クラスには十じゅう八はち人にんの学がく生せいがいます。There are eighteen students in the class.