Looking for the meaning or definition of the word retardance? Here's what it means.
Noun
(physics) The difference in phase shift between two characteristic polarizations of light upon reflection from an interface. Retardance can be reported in the Abelès or Mueller conventions. The retardance phase shift angle is often specified in degrees.
Examples
Levagard and Disflamoil ranges use impregnation and a transparent multi-layer coating system to ensure halogen-free flame retardance.