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number-cruncher (informal) a person, machine, program or the like that performs a great many complicated numerical calculations.
octane number a number that designates the antiknock properties of a gasoline, based on the percentage of isooctane in it; octane rating.
odd number a whole number that cannot be divided exactly by 2.
one-digit number a whole number containing one digit, such as 2.
ordinal number any number that is used to express order in a series, such as first, second, or tenth. (Cf. cardinal number.)
perfect number a positive integer that is equal to the sum of its divisors, including one but excluding itself.
Personal Identification Number an identification number entered on a keypad to gain remote electronic access to one's bank account or other financial accounts.
phone number a short form of telephone number.
prime number a number, such as 2 or 11, that can be evenly divided only by itself or by 1.
registration number (chiefly British) the registered set of numbers and letters found on the license plates of a vehicle; license plate number.
round number a number given in terms of the nearest whole number, or given in the nearest tens, hundreds, or the like. The number 50 is a round number for 47.
serial number a number that is one of a series and is assigned to someone or something for identification, as to a soldier, automobile, or piece of paper currency.
Social Security Number a number issued by the U.S. federal government to citizens, permanent residents, and temporary working residents of the United States for the purposes of tracking working individuals.
three-digit number a whole number containing three digits, such as 365.
two-digit number a whole number containing two digits, such as 22.
whole number the number one and any number obtained by successively adding one to get the next number, and the number zero.
without number countless.
wrong number a telephone number incorrectly or mistakenly dialed. [2 definitions]