Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The cardinal number equal to 17 + 1.
  • noun The 18th in a set or sequence.

from The Century Dictionary.

  • Eight more than ten, or one more than seventeen: a cardinal numeral.
  • noun The sum of ten and eight, or seventeen and one.
  • noun A symbol representing eighteen units, as 18, or XVIII, or xviii.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Eight and ten.
  • noun The number greater by a unit than seventeen; eighteen units or objects.
  • noun A symbol denoting eighteen units, as 18 or xviii.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The cardinal number occurring after seventeen and before nineteen, represented in Roman numerals as XVIII and in Arabic numerals as 18.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the cardinal number that is the sum of seventeen and one
  • adjective being one more than seventeen

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Middle English eightetene, from Old English eahtatēne; see oktō(u) in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Middle English ehtetene, from Old English eahtatīene, eahtatēne, from Proto-Germanic *ahtōutehun. Compare West Frisian achttjin, Dutch achttien, German achtzehn, Danish atten.

Examples

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