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A logical proposition that connects two terms with an “or”. This can be in the form of an inclusive, or an exclusive “or”.

Example for an inclusive disjunction (adjunction):

Would you like sugar or milk in your coffee [or both]?

Example for an exclusive disjunction (contravalence):

You can have ice cream or fruit salad for dessert [but not both].


The term “disjunction” is here used as a general term for two different (though closely related) logical forms that are both expressed with the same word (“or”) in common English.

For more information, see the articles on adjunction and contravalence.

See also

  • Adjunctioninclusive disjunction: A or B (or both)
  • Contravalence - exclusive disjunction: A or B (but not both)

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