different between contrapositive vs contraposition

English

contra- +? positive

contrapositive (plural contrapositives)

From a proposition, its inverse, its converse, and its contrapositive are derived as follows:
Proposition: "If P then Q."
Inverse: "If not P then not Q."
Converse: "If Q then P."
Contrapositive: "If not Q then not P."
If a proposition is true then its contrapositive is, too. Thus, if the statement "If I'm Roman, then I can speak Latin" is true, then it logically follows that the statement "If I can't speak Latin, then I'm not Roman" must also be true.

contra- +? position

contraposition (countable and uncountable, plural contrapositions)

(countable, logic) The statement of the form "if not Q then not P", given the statement "if P then Q".
Opposition; contrast.
- 2012, Erwin W. Straus, Maurice Natanson, Henri Ey, Psychiatry and Philosophy (page 76)
  The expression “Allon” indicates the unique character of this relationship: that of being together in contraposition. I belong to the Allon, and yet detach myself from it.

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