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Before determining the meaning of the word disjunction, it is interesting that we make clear its etymological origin. Specifically, we can say that it emanates from Latin, and more exactly from the word "disiunctio", which is the result of the sum of three components: the prefix "dis-", which is equivalent to "separation"; the noun "iunctus", which can be translated as "united"; and finally the suffix "-ción", which acts as a synonym for "action and effect".

Disjunction is the action and effect of disengaging and separating . The concept is used in several areas, such as genetics , the grammar and the philosophy .

The genetic disjunction is the separation of chromosomes through the processes of mitosis (the division in which each cell daughter receives a full complement of chromosomes after duplication of genetic material) or meiosis (the succession of two cell divisions in the process of gamete formation, which derives in four cells where each has a chromosome of each pair of the original cell).

In the grammar , is known as disjunction or disjunctive conjunction to word (or set of them) that indicates an exclusive or exclusive alternation. The expression "Let's go to Miami or Punta Cana" presents the disjunction "or"while the phrase “Choose between Pedro or Oscar” includes the disjunctive conjunction "or". Other examples of these conjunctions are "Do you want sausages or hamburgers?", “I don't know whether to call the manager or the executive director”, "We have to think about the car or another good to settle the debt".

For the rhetoric , disjunction is a figure that is formed when each sentence carries all its necessary parts, even when none of these sentences is necessary for the sense of the preceding or the following.

It should not be overlooked that within the Earth Sciences the use of the term we are now analyzing is used. Specifically, in that field there is talk of what has been called columnar disjunction, which is a breakdown of the rocks that occur as a result of tensions arising from the fact that the lava has cooled.

On the Portuguese island of Porto Santo, located about 40 kilometers from Madeira, you can see, for example, various columnar disjunctions in the basalts that are part of its landscape.

The Dphilosophical isyunction it implies the separation of two realities, although both are intrinsically related to each other (up / down, right / left, etc.).

The logical disjunction Finally, it is the statement that is true when any of the operators is true.

Precisely within this last sector, we should make it clear that there is a type of logical disjunction that is called exclusive disjunction. This we can determine that is defined by the fact that it is formed by two operands and that it will be true if only one of these two is true.

This type of disjunction, also called exclusive, is usually represented by several symbols, including EOR, XOR or EXOR.

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