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I am in an argument about the phrase "either A or B". I believe it is necessarily exclusive, meaning it refers the possibilities of A or B but not both.

But, after scouring the internet, I can't find a reliable source to back me up. How could I definitively determine whether I am right or not?

(I found this by the way, but it refers to "either-or" and not the longer phrase "either [one thing] or [another thing]")

dgrannis
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    It means many things. To a mathematician you'd need to specify "inclusive OR" or "exclusive OR" to be sufficiently precise. – Hot Licks Oct 20 '20 at 18:35
  • There may be natural languages that enforce the distinction between inclusive and exclusive "or", but English definitely isn't one of them. – user888379 Oct 20 '20 at 19:26

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