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fab

[fab]
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adjective Slang.
  1. fabulous(def 2).

Origin of fab

First recorded in 1960–65; by shortening
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for fab

fab1

adjective
  1. short for fabulous
interjection
  1. an expression of approval or enthusiasm

FAB2

abbreviation for
  1. flavoured alcoholic beverage
  2. fuel air bomb
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

Word Origin and History for fab

adj.

1957, slang shortening of fabulous.

Online Etymology Dictionary, © 2010 Douglas Harper