In-vĕr'sion, n.

n. [Lat. inversio, Fr. & Sp. inversion, It. inversione.] See INVERT.

1. The act of inverting, or turning over or backward.
2. A complete change of order; a reversed position; a turning or change of the natural order of things.

It is just the inversion of an act of Parliament; your lordship first signed it, and then it was passed among the Lords and Commons. Dryden.

3. (Mil.) A movement in tactics by which, the front and rear ranks not changing places, what is the right, when in line as usual, becomes the left.
4. (Math.) A change in the order of the terms of a proportion, so that the second takes the place of the first, and the fourth of the third.
5. (Gram.) A change of the usual order of words; as, “of all vices, impurity is one of the most detestable,” instead of, “impurity is one of the most detestable of all vices.”
6. (Rhet.) A method of reasoning in which the orator shows that the arguments advanced by his adversary in opposition to him are really favorable to his cause.
7. (Mus.) The change of position of a subject from one part to another; the change of position by the tones of a chord.
8. (Geol.) The folding back of strata upon themselves, as by upheaval, in such a manner that the order of succession appears to be reversed.