Definitions:
the action of inverting something or the state of being inverted

a reversal of the normal decrease of air temperature with altitude, or of water temperature with depth.

the process of inverting an interval, chord, or phrase.

the process of finding a quantity, function, etc. from a given one such that the product of the two under a particular operation is the identity.

the action or practice of relocating a multinational company's legal residence to a jurisdiction where taxes are levied at a lower rate

homosexuality.