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ei·ther-or | \ ˌē-t͟hər-ˈȯr also ˌī- 
\
\Definition of either-or
(Entry 1 of 2)
: an unavoidable choice or exclusive division between only two alternatives
either-or
adjectiveDefinition of either-or (Entry 2 of 2)
: of or marked by either-or : black-and-white
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The first known use of either-or was in 1922
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