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Why is the ninth month called September?

back formation

noun, Linguistics
1.
the analogical creation of one word from another word that appears to be a derived or inflected form of the first by dropping the apparent affix or by modification.
2.
a word so formed, as typewrite from typewriter.
Origin
1885-1890
1885-90
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for back formation

back formation

noun
1.
the invention of a new word on the assumption that a familiar word is derived from it. The verbs edit and burgle were so created from editor and burglar
2.
a word formed by this process
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Difficulty index for back formation

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Word Value for back

12
14
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