AskDefine | Define ninety

Dictionary Definition

ninety adj : being ten more than eighty [syn: 90, xc] n : the cardinal number that is the product of ten and nine [syn: 90, XC]

User Contributed Dictionary



Cardinal number



Extensive Definition

90 (ninety) is the natural number preceded by 89 and followed by 91.

In mathematics

90 is the sum of the squares of the integers 2 to 6. Because 90 is the sum of its unitary divisors (excluding itself), it is a unitary perfect number, and because it is equal to the sum of a subset of its divisors, it is a semiperfect number. 90 is a pronic number. But it is also a nontotient. It is a Perrin number, preceded in the sequence by 39, 51, 68.
In normal space, the interior angles of a square measure 90 degrees each. Also, in a right triangle, the angle opposing the hypotenuse measures 90 degrees, with the other two angles adding up to 90 for a total of 180 degrees. Thus, an angle measuring 90 degrees is called a right angle.
90 is divisible by the sum of its base 10 digits, thus it is a Harshad number.

In astronomy

In other fields

Ninety is:

In sports


ninety in Catalan: Noranta
ninety in Chuvash: 90 (хисеп)
ninety in Corsican: 90 (numeru)
ninety in Danish: 90 (tal)
ninety in Spanish: Noventa
ninety in Esperanto: Naŭdek
ninety in Basque: Laurogeita hamar
ninety in French: 90 (nombre)
ninety in Gan Chinese: 90
ninety in Korean: 90
ninety in Interlingua (International Auxiliary Language Association): 90 (numero)
ninety in Italian: 90 (numero)
ninety in Hebrew: 90 (מספר)
ninety in Haitian: 90 (nonm)
ninety in Kurdish: Nod
ninety in Lithuanian: 90 (skaičius)
ninety in Lombard: Nümar 90
ninety in Hungarian: 90 (szám)
ninety in Malay (macrolanguage): 90 (nombor)
ninety in Dutch: 90 (getal)
ninety in Japanese: 90
ninety in Norwegian: 90 (tall)
ninety in Polish: 90 (liczba)
ninety in Portuguese: Noventa
ninety in Russian: 90 (число)
ninety in Sicilian: Nuvanta
ninety in Slovenian: 90 (število)
ninety in Swedish: 90 (tal)
ninety in Thai: 90
ninety in Vietnamese: 90 (số)
ninety in Wu Chinese: 90
ninety in Yiddish: 90 (נומער)
ninety in Contenese: 90
ninety in Chinese: 90
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