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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.
An insignia (Latin: Ä«nsignia, nominative plural of insignium, emblem, token, symbol), plural insignias, is a symbol or token of personal power, status or office, or of an official body of government or jurisdiction. An insignia is usually the emblem of a specific or general authority.