eighteenthKK [eˋtinθ] /eɪˈtinθ/形容詞1第十八的、第十八個She celebrated her eighteenth birthday with a few close friends.她和幾個好友一起慶祝十八歲生日。名詞1第十八、第十八個He finished eighteenth out of more than two hundred runners.他在兩百多名跑者中拿到第十八名。2十八日、十八號The results will be announced on the eighteenth of next month.結果將在下個月十八日公布。3十八分之一Each investor owns roughly an eighteenth of the company.每位投資人約持有公司十八分之一的股份。