18

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18

A child carefully writes the number 18 on a chalkboard.

Definition

  1. Adjective:

    • Being one more than seventeen: A number that is the sum of seventeen and one; the number following 17 and preceding 19.

  2. Noun:

    • The cardinal number that is the sum of seventeen and one: The symbol or name representing the quantity of 18 items. It is an integer and an even number.
Usage Examples
  • Adjective:
    • She has 18 unread messages in her inbox.
    • The recipe requires 18 ounces of flour.
  • Noun:
    • The answer to the equation is 18.
    • He celebrated his eighteenth birthday last week. (Note: 'eighteenth' is the ordinal form derived from the cardinal number '18').
Advanced Usage
  • Legal Context: In many jurisdictions, 18 is the age of majority, marking the transition to legal adulthood, including the right to vote and sign contracts.
    • In this country, you become a legal adult at 18.
  • Sports Jersey Numbers: The number 18 is often worn by players in various team sports.
    • The quarterback famously wore the number 18.
Variants and Related Words
  • Eighteen (n, adj): The standard written and spoken form of the number.
  • XVIII (n, adj): The Roman numeral representation of the number.
  • Eighteenth (adj, n): The ordinal number corresponding to 18, indicating position in a sequence (e.g., the eighteenth century).
Synonyms
  • A score minus two: An archaic or poetic way to refer to the number, as a 'score' means twenty.
  • (No direct single-word synonyms for the numeral): Other numbers are not synonyms. Descriptions like "the age of majority" refer to a concept associated with the number, not the number itself.
Related Phrases
  • 18-wheeler (n): A large tractor-trailer truck, named for its typical total of 18 wheels.
    • The highway was busy with 18-wheelers.
  • At 18: A phrase indicating the specific age.
    • She moved out at 18.
Related Idioms
  • Sweet 18: A less common variation of "Sweet 16," sometimes used to mark an 18th birthday celebration.
    • Her parents threw a huge party for her sweet 18.
18

A child carefully writes the number 18 on a chalkboard.

Adjective
  1. being one more than seventeen
Noun
  1. the cardinal number that is the sum of seventeen and one

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