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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.
Appertaining to a decree; containing a decree; as, a decretal epistle. n. 1. (R. C. Ch.) An authoritative order or decree; especially, a letter of the pope, determining some point or question in ecclesiastical law. The decretals form the second part of the canon law. 2. (Canon Law) The collection of ecclesiastical decrees and decisions made, by order of Gregory IX., in 1234, by St.