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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.
Definition of elective. 1  1a : chosen or filled by popular election an elective officialb : of or relating to electionc : based on the right or principle of election the presidency is an elective office. 2  2a : permitting a choice : optional an elective course in schoolb : beneficial to the patient but not essential for survival elective surgery.