Definition

1. Adjective:
   • Being ten more than seventy; equal to the product of eight and ten; the number 80.
2. Noun:
   • The cardinal number that is the product of ten and eight; the figure or symbol representing this number (80, LXXX).
   • (plural: the eighties) The decade from 80 to 89 in a century, especially the twentieth century (1980–1989).
   • (plural: the eighties) The period of life between the ages of 80 and 89.

Examples

• Adjective:
  • The old castle has eighty rooms.
  • She will be eighty years old next month.
• Noun (cardinal number):
  • The answer is eighty.
  • Write eighty in numerals.
• Noun (plural: the eighties):
  • My parents were born in the eighties (the 1980s).
  • He is in his eighties, but he is still very active.

Advanced Usage

• "Eighty-something": Used informally to indicate an age in the eighties when the exact number is not specified or is unimportant.
  • My grandfather is eighty-something and still goes for a walk every day.
• "Eighty-one, eighty-two, etc.": The numbers following eighty (81, 82, etc.).

Variants and Related Words

• Eightieth (adj.): Constituting number eighty in a sequence; 80th.
  • They celebrated their eightieth wedding anniversary.
• Eightieth (n.): The position or rank corresponding to the number eighty; one of eighty equal parts.
  • He finished in eightieth place in the race.
  • An eightieth of the total amount.

Synonyms

• Fourscore (adj., n.): An archaic term meaning eighty.
  • "Fourscore and seven years ago..." (from the Gettysburg Address).

Related Phrases

• The roaring eighties: A historical term sometimes used for the 1880s, particularly in Australia, or more generally for a period of economic prosperity and social change.
• Mid-eighties: The period around the middle of a decade in the eighties (e.g., around 1984–1986, or age 84–86).

Adjective

1. being ten more than seventy

Noun

1. the cardinal number that is the product of ten and eight