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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.
insignia - a badge worn to show official position. I.D., ID - a card or badge used to identify the bearer; you had to show your ID in order to get in. black belt - a black sash worn to show expert standards in the martial arts (judo or karate) blue ribbon, cordon bleu - an honor or award gained for excellence.