either-or

[ee-ther-awr, ahy-ther-]
adjective
allowing no equivocation; being limited in choice to two options: It's an either-or situation—you pay the bill or you lose the company's services.

Origin:
1925–30

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
either-or
 
adj
presenting an unavoidable need to choose between two alternatives: an either-or situation

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The combination of diversity and sustainability is not an either-or proposition but a both-and.
By questioning either-or commonplaces about students and reading, the study suggests many promising directions for teaching.
He was displaying the blinkered, narrow, either-or mentality of the true cultural snob.
The either-or option is only available during the transition year.
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