Definition

Adjective The ordinal number corresponding to the cardinal number one hundred; denoting position in a sequential order.

Usage

Used to indicate the position of something in a series that has ninety-nine items before it. * She finished in 100th place in the marathon. * We are celebrating the company's 100th anniversary this year. * This is the 100th edition of the magazine.

Advanced Usage

• As a fractional indicator: Can imply one part out of one hundred equal parts, synonymous with "one hundredth" (1/100).
  • A 100th of a second can make the difference in an Olympic race.
• In formal or historical sequencing: Often used in titles and commemorations.
  • The 100th Congress of the United States.

Variants and Related Words

• Hundredth: The more common form for both the ordinal adjective and the noun meaning "one part in a hundred".
  • Adjective: the hundredth customer.
  • Noun: a hundredth of the total.
• Centennial: (Noun/Adjective) Pertaining to a 100th anniversary.
• Centenary: (Noun/Adjective) Chiefly British variant of 'centennial'.

Synonyms

• Hundredth
• Centesimal (technical, relating to hundredths)

Notes on Form

• The numeral form is "100th" or "100th".
• The written word form is "hundredth". "100th" is typically read aloud as "one hundredth" or "the hundredth".

Adjective

1. the ordinal number of one hundred in counting order