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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.
accretion - (astronomy) the formation of a celestial object by the effect of gravity pulling together surrounding objects and gases. astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole.