Definition of eighteen in US English:


cardinal number

  • 1Equivalent to the product of two and nine; one more than seventeen, or eight more than ten; 18.

    ‘she wrote eighteen novels’
    ‘out of sixty batches checked, eighteen were incorrect’
    ‘eighteen of the guests were gathered’
    • ‘I paid with a twenty and got seventeen or eighteen dollars in change.’
    • ‘The rest received sentences of seventeen or eighteen years.’
    • ‘It was submitted that his decision in the claimant's case to extend the period of nine months to eighteen months was a matter of judgement which was within his discretion.’
    • ‘After this the team filmed the family eighteen hours a day for three months.’
    • ‘All eighteen players who met this criteria remained in organized baseball three years later.’
    • ‘Had this been written eighteen months ago, there'd have been a queue of people lining up to laugh at these views, and I'd have been there at the front.’
    • ‘They have conceded thirty five goals in eighteen games.’
    • ‘For the first eighteen months of his term, Davis enjoyed great political fortune.’
    • ‘All eighteen players played their hearts out and were ecstatic when the final whistle came.’
    • ‘I run a small team that has spent the last eighteen months working on a variety of game projects.’
    • ‘Just eighteen more hours until my high school days are over forever.’
    • ‘Seventeen out of eighteen provinces were in open revolt.’
    • ‘She died on September 30, 1897 at the age of 24 after eighteen months of great physical suffering and desolation of spirit.’
    • ‘The two men travelled to the Southern French town last year with eighteen musicians aged between 16-19 years old.’
    • ‘The remaining eighteen quotes ranged from £315 to £462, with seven firms unable to provide a quote.’
    1. 1.1 A set or team of eighteen individuals.
      • ‘Though he has trained for field gun before, this is his first time in the final eighteen.’
      • ‘They had six athletes in the top eighteen.’
      • ‘They lost three, including the first of the tour, an innings defeat by a Victorian eighteen.’
      • ‘This panel was reduced and Aoife found herself in the last eighteen.’
      • ‘The bunkers were in an unbelievable condition no doubt due to the efforts by the ground keepers on the other eighteen which made them almost unplayable.’
    2. 1.2 Eighteen years old.
      ‘he was barely eighteen’
      • ‘I was eighteen and I barely knew anything about the world around me!’
      • ‘When I turned, two young guys, perhaps seventeen or eighteen, were standing before me.’
      • ‘Dee expects him to continue to attend until the age limit of eighteen.’
      • ‘Reaching the age of eighteen was quite significant for me, as it allowed me the opportunity to cast my first parliamentary vote.’
      • ‘He was the son of a cooper and entered the army in 1870 aged eighteen.’
      • ‘She's seventeen about to turn eighteen but we got married with parental permission.’
      • ‘Like her brothers before her, she had left home long before reaching the age of eighteen.’
      • ‘Most people who have tried smoking smoked their first cigarette before the age of eighteen.’
      • ‘She was barely eighteen, apparently, and looked younger.’
      • ‘By age eighteen, most have witnessed thousands of murders on television and video games.’
      • ‘Even after all these years, his smile still made her feel eighteen again.’
      • ‘Just because staff members are over the age of eighteen does not mean they have the maturity of an adult.’
      • ‘She returned to Scotland as Queen of the Scots aged eighteen in 1561.’
      • ‘John emigrated to England at the age of eighteen.’
      • ‘How could the twins already be seventeen, eighteen in a month?’
      • ‘No one knew that she was only sixteen and he was only eighteen.’
      • ‘Children must remain in full-time education until age sixteen and in part-time until age eighteen.’
      • ‘All band members, however, must be aged eighteen or over.’
      • ‘For thousands under the age of eighteen, this is their reality.’
      • ‘I hoped I wasn't looking forward to college and turning eighteen for nothing.’
    3. 1.3 A size of garment or other merchandise denoted by eighteen.
      • ‘Judging by old photos of her, she looked to be about a size eighteen.’
      • ‘She stocks sizes eight to eighteen and takes orders for bigger sizes.’


Old English e(a)htatēne (see eight, -teen).