(geometry, inversive geometry, for a given circle with centre O and radius r) A transformation that maps any point P ≠ O to the point P’ on the ray from O through P for which OP × OP’ = r², and which maps O to the point at infinity.

(software architecture) Abstract principle describing an aspect of some software architecture designs in which the flow of control of a system is inverted in comparison to the traditional architecture, getting the flow of control from a generic code part.

(physics) The creation of a system in which more atoms or molecules are in an excited state than in a ground state.

plural of island of inversion

(chemistry) A region of the chart of nuclides that contains isotopes with a non-standard ordering of single particle levels in the nuclear shell model.

A therapy in which the patient hangs upside down or at an inverted angle, claimed to treat backache etc.

(meteorology) An atmospheric condition in which a cooler layer of air lies below a warmer layer of air that functions as a "ceiling" for the cooler layer, interfering with normal atmospheric circulation and trapping pollutants.

plural of inversion pair

plural of inversion table

A device to enable a person to be comfortably upside-down as part of inversion therapy.