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Freebase(5.00 / 1 vote)Rate this definition: Electret. Electret is a dielectric material that has a quasi-permanent electric charge or dipole polarisation. An electret generates internal and external electric fields, and is the electrostatic equivalent of a permanent magnet. Oliver Heaviside coined this term in 1885.
decretal. 1  pertaining to, of the nature of, or containing a decree or decrees. 2  a papal decree authoritatively determining some point of doctrine or church law. 3  Decretals, the body or collection of such decrees as a part of the canon law.