(chemistry) The rapid inversion of the lone pair in a molecule such as a tertiary amine which prevents it from being chiral.

(mathematics) Proportional to the reciprocal of the independent variable.

(mathematics) For a given function f, another function, denoted f⁻¹, that reverses the mapping action of f; (formally) given a function f:X→Y, a function g:Y→X such that, ∀x∈X,f(x)=y⟹g(y)=x.

(mathematics) a pair of integers (i,j) is an inversion pair of some permutation 𝜎 if i𝜎(j).

(music) A technique where the composer will take the inversion of the tone row, and write that backwards, thus creating a retrograded inversion of the original note row.

(mathematics) The inverse with respect to addition; the opposite.

(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.

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

plural of inversion table

(computing, dated) A display technique whereby background and foreground colours are interchanged, typically used for highlighting.