From Longman Dictionary of Contemporary Englisheighteeneigh‧teen /ˌeɪˈtiːn◂/ ●●● S3 W2 number HMNthe number 18 At least eighteen bullets were fired. Jim was eighteen (=18 years old). —eighteenth adjective, pronoun in the eighteenth century her eighteenth birthday I’m planning to leave on the eighteenth (=the 18th day of the month).
Examples from the Corpus
eighteen• Six had been killed in action, eighteen had died in service, and thirty-six had been wounded.• Bobby was eighteen, nineteen, something like that.• The remaining eighteen were likely to resist for a variety of reasons.the eighteenth• Let's have dinner on the eighteenth.Origin eighteen Old English eahtatiene, from eahta “eight” + tien “ten” 