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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 is a term used to refer to a situation in which something is growing in size. The term appears in a number of different contexts, from finances to astrophysics. Accretion process are constantly ongoing in a variety of locations around the Earth and the universe.