Routledge Dictionary of Language and Linguistics
In formal logic connection of two elementary propositions p and q by or, such that the propositional connection is true if and only if either p or q is true, but not if both are true (in contrast with inclusive or, 
disjunction).
This relation is represented in the (two-place) truth table:
| p | q | p q |
| t | t | f |
| t | f | t |
| f | t | t |
| f | f | f |
This or (also: exclusive or), which corresponds to Lat. aut…aut… (‘either this one or the other one, but not both of them’) frequently occurs in everyday language.
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