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1 part in 100 million equal parts


quantity noun (quantities and units of measure)



Original source:

Princeton WordNet


1/100,000,000 [North America] | 1/100.000.000 [Europe] | 1/100000000 | 100,000,000th [North America] | 100.000.000th [Europe] | 100-millionth | 100000000th | hundred-millionth

Definition references

Collins Dictionary:

simple fraction | common fraction [synonym] | vulgar fraction [synonym]

a fraction in which the numerator and denominator are both integers expressed as a ratio rather than a decimal (19 of 209 words)


Macmillan British Dictionary:

common fraction [countable, math] | common fractions [plural]

a fraction written as one number above a line and another number below the line, instead of as numbers separated by a decimal point. ¾ is a common ... (28 of 59 words)



common fraction

a fraction (as ; 12 ; or ; 34 ;) in which the numerator and denominator are both integers and are separated by a horizontal or slanted line (28 of 41 words)

www​.merriam-webster​.com​/dictionary​/common fraction

Oxford Dictionary:

common fraction

Syllabification: (com·mon frac·tion) Entry from United States Dictionary | a fraction expressed by a numerator and a denominator, not decimally. (19 of 36 words, 2 definitions)


Cambridge Dictionary:

common fraction [specialized]

a fraction in which there is a horizontal line with one number above it and one number below it; a vulgar fraction (22 of 32 words)


Random House Dictionary:

common fraction [math] | vulgar fraction [synonym]

a fraction represented as a numerator above and a denominator below a horizontal or diagonal line. (16 of 28 words)


American Heritage Dictionary:

common fraction

A fraction having an integer as a numerator and an integer as a denominator. (14 of 17 words)



common fraction [math] | common fractions [plural] | vulgar fraction [synonym]

A fraction in the form of one integer divided by another, non-zero, integer. (13 of 16 words)

en​.wiktionary​.org​/wiki​/common fraction

New World Dictionary:

common fraction | simple fraction | vulgar fraction

a fraction whose numerator and denominator are both whole numbers (10 of 12 words)


Encarta Dictionary:

simple fraction | simple fractions [plural] | common fraction [math] | common fractions [math, plural] | vulgar fraction [math] | vulgar fractions [math, plural]

a fraction that consists of two whole numbers separated by a horizontal or slanting line, as opposed to a decimal fraction (21 of 36 words)

encarta​.msn​.com​/dictionary 1861732779​/definition​.html  [offline]

Audio reference

the Free Dictionary:


Audio 1: North American English pronunciation of "one-hundred-millionth"

Audio 2: British English pronunciation of "one-hundred-millionth"


Page last updated: 2013-06-26

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