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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.
For the Cruise Ship Insignia see Oceania Cruises For the General Motors car Insignia see Opel Insignia Insignia (the plural of Latin insigne'': emblem, symbol) is a symbol or token of personal power, status or office, or of an official body of government or jurisdiction.