In mathematics, the word exactly is used to emphasize
that only one of a set of choices is allowed. The sentence, "Exactly one of these
is true," means that no more than one and no less than one can be true, but precisely
one is true.
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McAdams, David E. Exactly. 7/9/2018. All Math Words Encyclopedia. Life is a Story Problem LLC. http://www.allmathwords.org/en/e/exactly.html.
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