Definition

1. Adjective:

   • Being the ordinal number corresponding to the cardinal number eighty; positioned at number 80 in a sequence.

2. Noun:

   • The position or rank of number 80 in a countable series.
   • One of eighty equal parts of a whole.

Usage Examples

• Adjective:

  • She celebrated her eightieth birthday with a large party.
  • This is the eightieth edition of the annual report.

• Noun (Position/Rank):

  • He finished in eightieth place in the marathon.
  • The item is listed as the eightieth on the inventory.

• Noun (Fraction):

  • An eightieth of the total revenue was allocated to research.
  • Approximately one eightieth of the population participated in the survey.

Advanced Usage

• "the eightieth of": Used to specify a particular date or instance in a sequence.
  • We will observe the eightieth anniversary of the event next year.

Variants and Related Words

• Eighty (n, adj): The cardinal number equivalent to eight tens (80).
• Eightiethly (adv, rare): In the eightieth place (used in enumerations).

Synonyms

• 80th (adj, n): The numeric symbol for eightieth.

Notes on Meaning

• As an adjective, "eightieth" modifies a noun to indicate its position in an order (e.g., the eightieth day).
• As a noun, it can refer abstractly to the rank itself or concretely to a fractional part (1/80).

Adjective

1. the ordinal number of eighty in counting order

Noun

1. position 80 in a countable series of things