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eighteen

[ey-teen]
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noun
  1. a cardinal number, ten plus eight.
  2. a symbol for this number, as 18 or XVIII.
  3. a set of this many persons or things.
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adjective
  1. amounting to 18 in number.
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Origin of eighteen

before 1000; Middle English ehtetene, Old English eahtatēne; cognate with Old Norse āttjān, German achtzehn. See eight, -teen
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for eighteen

eighteen

noun
  1. the cardinal number that is the sum of ten and eight and the product of two and nineSee also number (def. 1)
  2. a numeral, 18, XVIII, etc, representing this number
  3. the amount or quantity that is eight more than ten
  4. something represented by, representing, or consisting of 18 units
  5. (functioning as singular or plural) a team of 18 players in Australian Rules football
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determiner
    1. amounting to eighteeneighteen weeks
    2. (as pronoun)eighteen of them knew
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Word Origin

Old English eahtatēne; related to Old Norse attjan, Old High German ahtozehan
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for eighteen

n.

late 14c., eightene, earlier ahtene (c.1200), from Old English eahtatene, eahtatyne; see eight + -teen. Cf. Old Saxon ahtotian, Dutch achttien, Old High German ahtozehan, German achtzehn, Old Norse attjan, Swedish adertån.

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Online Etymology Dictionary, © 2010 Douglas Harper