AskDefine | Define eighty

Dictionary Definition

eighty adj : being ten more than seventy [syn: 80, lxxx, fourscore] n : the cardinal number that is the product of ten and eight [syn: 80, LXXX, fourscore]

User Contributed Dictionary



Cardinal number


Derived terms


Related terms

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Extensive Definition

80 (eighty) is the natural number following 79 and preceding 81.

In mathematics

The sum of Euler's totient function φ(x) over the first sixteen integers is 80.
Adding up some subsets of its divisors (e.g., 1, 4, 5, 10, 20 and 40) gives 80, hence 80 is a semiperfect number.
80 is a Harshad number number in base 10.

In astronomy

In other fields

Eighty is also:

External links

  • for 80 in other languages.
eighty in Catalan: Vuitanta
eighty in Chuvash: 80 (хисеп)
eighty in Corsican: 80 (numeru)
eighty in Danish: 80 (tal)
eighty in Spanish: Ochenta
eighty in Esperanto: Okdek
eighty in Basque: Laurogei
eighty in French: 80 (nombre)
eighty in Gan Chinese: 80
eighty in Korean: 80
eighty in Interlingua (International Auxiliary Language Association): 80 (numero)
eighty in Italian: 80 (numero)
eighty in Hebrew: 80 (מספר)
eighty in Haitian: 80 (nonm)
eighty in Kurdish: Heyştê
eighty in Latin: Octoginta
eighty in Lithuanian: 80 (skaičius)
eighty in Lombard: Nümar 80
eighty in Hungarian: 80 (szám)
eighty in Malay (macrolanguage): 80 (nombor)
eighty in Dutch: 80 (getal)
eighty in Japanese: 80
eighty in Norwegian: 80 (tall)
eighty in Norwegian Nynorsk: Talet 80
eighty in Polish: 80 (liczba)
eighty in Portuguese: Oitenta
eighty in Russian: 80 (число)
eighty in Sicilian: Ottanta
eighty in Slovenian: 80 (število)
eighty in Swedish: 80 (tal)
eighty in Thai: 80
eighty in Vietnamese: 80 (số)
eighty in Turkish: 80 (sayı)
eighty in Wu Chinese: 80
eighty in Yiddish: 80 (נומער)
eighty in Contenese: 80
eighty in Chinese: 80
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