arccosine

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

plural of inverse matrix

the inverse element with respect to multiplication; the reciprocal

(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.

(mathematics) The property of being inversely proportional.

The mathematical process of recovering the movements of an object from some other data, such as a film of those movements; it is useful in robotics and in creating animations.

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