Eighteen

//ˈeɪ(t).tin// name, num

name, num ·Uncommon ·Advanced level

Definitions

Noun
  1. 1
    the cardinal number that is the sum of seventeen and one wordnet
Adjective
  1. 1
    being one more than seventeen wordnet
Numeral
  1. 1
    The cardinal number occurring after seventeen and before nineteen, represented in Roman numerals as XVIII and in Arabic numerals as 18.

    "The right of citizens of the United States, who are eighteen years of age or older, to vote shall not be denied or abridged by the United States or by any State on account of age."

Proper Noun
  1. 1
    A surname.

Synonyms

All synonyms
1818xviiixviii

Example

More examples

"Now that you are eighteen, you can get a driver's license."

Etymology

Etymology 1

From Middle English eightetene, eiȝtene, ehtetene, from Old English eahtatīene, eahtatēne, from Proto-Germanic *ahtōutehun. Cognate with West Frisian achttjin, Dutch achttien, German achtzehn, Danish atten. Equivalent to eight + -teen

Etymology 2

Derived from place names such as Ayton, Eaton, and Eton.

Related phrases

eighteen-wheeler

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.