(redirected from Apses) Also found in: Dictionary, Thesaurus, Acronyms, Encyclopedia.
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.
âAs it appears in â¦ â. http://www.pri.org/stories/2014-09-04/ever-wonder-what-black-and-white-isis-flag-means. Itâs become a symbol thatâs hard to ignore this summer: The black flag with white Arabic writing flown by ISIS, the militant group in Iraq and Syria that calls itself the Islamic State.. http://www.pri.org/stories/2014-09-04/isis-has-new-hand-sign-and-it-means-far-more-we-re-1. The Islamic State militants, known as ISIS, are now using a single, raised index finger as the symbol of their cause. Itâs a well-known sign of power and victory around the world, but for ISIS, it has a more sinister meaning.