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number US English

An arithmetical value, expressed by a word, symbol, or figure, representing a particular quantity and used in counting and making calculations and for showing order in a series or for identification

number US Thesaurus

a whole number

E-number US English

A code number preceded by the letter E, denoting food additives numbered in accordance with EU directives

f-number US English

The ratio of the focal length of a camera lens to the diameter of the aperture being used for a particular shot (e.g., f8, indicating that the focal length is eight times the diameter)

E-number New Oxford Dictionary for Writers & Editors

EU code number for food additives

f-number New Oxford Dictionary for Writers & Editors

ratio of the focal length of a camera lens to the diameter of the aperture being used for a particular shot (e.g. f8)

back number US English

An issue of a periodical earlier than the current one

box number US English

A number identifying a private advertisement in a newspaper and functioning as an address for replies

call number US English

A mark, especially a number, on the spine of a library book, or listed in the library’s catalog, indicating the book’s location in the library

mass number US English

The total number of protons and neutrons in a nucleus

number line US English

A line on which numbers are marked at intervals, used to illustrate simple numerical operations

number one US English

Oneself

number sign US English

The sign #, used to introduce a number (as in question #2)

Number Ten US English

10 Downing Street, the official London home of the British Prime Minister

number two US English

A second in command

number work US English

Simple arithmetic

PIN number US English

Personal identification number

wave number US English

The number of waves in a unit distance

Mach number New Oxford Dictionary for Writers & Editors

ratio of the speed of a body to the speed of sound (Mach 1, Mach 2, etc.)

atomic number US English

The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table

cetane number US English

A measure of the ignition properties of diesel fuel relative to cetane as a standard

Froude number US English

A dimensionless number used in hydrodynamics to indicate how well a particular model works in relation to a real system

golden number US English

The number showing a year’s place in the Metonic lunar cycle and used to fix the date of Easter for that year

guide number US English

A measure of the power of a flashgun expressed in meters or feet

Köchel number US English

A number given to each of Mozart’s compositions in the complete catalog of his works compiled by the Austrian scientist Ludwig von Köchel (1800–77) and his successors

lepton number US English

A quantum number assigned to subatomic particles that is ±1 for leptons and 0 for other particles and is conserved in all known interactions

magic number US English

A figure regarded as significant or momentous in a particular context

mixed number US English

A number consisting of an integer and a proper fraction

number eight US English

(In rugby union) the forward at the back of the scrum

number opera US English

An opera in which arias and other sections are clearly separable

number plate US English

British term for license plate.

number theory US English

The branch of mathematics that deals with the properties and relationships of numbers, especially the positive integers

octane number US English

A figure indicating the antiknock properties of a fuel, based on a comparison with a mixture of isooctane and heptane

plate number US English

A serial number in the margin of a plate from which postage stamps are printed

serial number US English

A number showing the position of an item in a series, especially one printed on paper currency or on a manufactured article for the purposes of identification

square number US English

The product of a number multiplied by itself, e.g. 1, 4, 9, 16

whole number US English

A number without fractions; an integer

Köchel number New Oxford Dictionary for Writers & Editors

number in the complete catalogue of Mozart's works compiled by L. von Köchel

cardinal number US English

A number denoting quantity (one, two, three, etc.), as opposed to an ordinal number (first, second, third, etc.)

compound number US English

A quantity expressed in terms of more than one unit or denomination, such as 5 feet 7 inches or 2 pounds 3 ounces

diploid number US English

The number of chromosomes present in the body cells of a diploid organism


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