A complete or partial disturbance of an isolated radioactive system by thermal, igneous, or tectonic activities which results in loss or gain of radioactive or radiogenic isotopes and, hence, a change in the radiometric age that will be given the disturbed system.

The development or superposition of metamorphic structures on original structures. Also known as imprint; metamorphic overprint; superprint.

1. To imprint over something that has been printed.

2. To apply a varnish or lacquer to printed matter from a type or litho process, by means of a brush, spray, or roller coating.

3. To print in a primary color over an existing color print to obtain a compound shade.