Eighty

Definition

Eighty is a noun and an adjective. It refers to the number that is the product of eight and ten, represented numerically as 80. It is also used as an adjective to describe a quantity or grouping of eighty items or units.

Parts of Speech

• Noun
• Adjective

Pronunciation

American English

• IPA Pronunciation: /ˈeɪti/
• Respelling: AY-tee

British English

• IPA Pronunciation: /ˈeɪti/
• Respelling: AY-tee

Etymology

The word "eighty" originates from the Old English "eahtatig," which combines "eahta" (eight) and "-tig" (group of ten). This form is rooted in Proto-Germanic, with cognates found in Dutch "tachtig" and German "achtzig," reflecting the base-ten counting system.

Derivatives

• Eightieth (ordinal adjective)
• Eighties (noun, plural)
• Eightyfold (adjective)
• Over-eighty (adjective)
• Nonagenarian (noun, technically refers to 90-99 but often used loosely for those over 80)

Synonyms

• Four-score
• Octogint (archaic)
• Octogenary (rare)

Antonyms

• None

Usage

The noun "eighty" is commonly used to refer to a total count, such as "The town had a population of eighty people." As an adjective, it describes quantities of eighty, as in "She received eighty points on the exam." The term is also used to refer to ages, decades, and historical periods, such as "She celebrated her eightieth birthday."

Related Terms

• Eight: The cardinal number represented by 8.
• Octogenarian: A person between eighty and eighty-nine years old.
• Decade: A period of ten years, often referring to groups of years.

Detailed Definitions

Noun

• The cardinal number equivalent to eight times ten: Refers to the quantity or numerical value represented by 80.
  • Example: "Eighty students enrolled in the class this semester."

Adjective

• Being a quantity or grouping of eighty: Describes a set or total that includes exactly eighty units.
  • Example: "The charity raised eighty dollars from the event."