Etymology
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fraction (n.)

late 14c., originally in the mathematical sense, from Anglo-French fraccioun (Old French fraccion, "a breaking," 12c., Modern French fraction) and directly from Late Latin fractionem (nominative fractio) "a breaking," especially into pieces, in Medieval Latin "a fragment, portion," noun of action from past participle stem of Latin frangere "to break (something) in pieces, shatter, fracture," from Proto-Italic *frang-, from a nasalized variant of PIE root *bhreg- "to break." Meaning "a breaking or dividing" in English is from early 15c.; sense of "broken off piece, fragment," is from c. 1600.

updated on May 17, 2017

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Definitions of fraction from WordNet
1
fraction (n.)
a component of a mixture that has been separated by a fractional process;
fraction (n.)
a small part or item forming a piece of a whole;
fraction (n.)
the quotient of two rational numbers;
2
fraction (v.)
perform a division;
Synonyms: divide
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.