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what-if

[hwuht-if, hwot‐, wuht‐, wot‐]
adjective
  1. hypothetical: a what-if scenario.
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noun
  1. a hypothetical case or situation; conjecture: a series of what-ifs.
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Origin of what-if

First recorded in 1980–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for what-if

what-if

noun
  1. informal a hypothetical question; speculationone of the great what-ifs of modern history
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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