eighteen

/'ei'ti:/

Thân thiện

A child carefully writes the number eighteen on a chalkboard.

Definition

1. Adjective:

   • Being one more than seventeen: The number that follows seventeen and precedes nineteen in the natural number sequence. It is represented by the numeral 18.

2. Noun:

   • The cardinal number that is the sum of seventeen and one: The number 18. It can represent a quantity, an age, or a position in a sequence.

Examples of Usage

• Adjective:
  • She has eighteen books on the shelf.
  • The recipe calls for eighteen eggs.
• Noun:
  • The number written on the door was eighteen.
  • He celebrated his eighteenth birthday last week. (Note: Here, 'eighteen' is used attributively to form the ordinal number 'eighteenth'.)

Advanced Usage

• "Sweet eighteen": A phrase sometimes used to refer to a person's 18th birthday, marking the transition to legal adulthood in many countries.
  • She is looking forward to her sweet eighteen.
• "Eighteen-hole course": A standard full-size golf course.
  • We played a round on an eighteen-hole course. (Note: This is a compound adjective; the core meaning of 'eighteen' as a quantity is retained.)

Variants and Related Words

• Eighteenth (adj, n): Constituting number eighteen in a sequence; the ordinal form of eighteen.
  • This is the eighteenth edition of the book.
• Eighteenfold (adv, adj): By a factor of eighteen; eighteen times as much.
  • The value increased eighteenfold.
• Eighteen-wheeler (n): A large truck with eighteen wheels (a compound noun).
  • The highway was busy with eighteen-wheelers.

Synonyms

• XVIII: The Roman numeral for eighteen.
• A score minus two: An archaic or poetic way to refer to the number (a score is twenty).

Related Phrases

• To be eighteen (years old): To have reached the age of eighteen.
  • In this state, you can vote if you are eighteen.
• Under eighteen: Younger than eighteen years of age.
  • The film is rated R, so no one under eighteen is admitted.

Related Idioms

• Eighteen to the dozen: Very rapidly or incessantly (a less common variant of the idiom "nineteen to the dozen").
  • She was talking eighteen to the dozen about her trip.

Học thuật

Adjective

1. being one more than seventeen

Noun

1. the cardinal number that is the sum of seventeen and one

Từ đồng nghĩa

• 18
• xviii
• XVIII