Antiparticle meaning

ăntē-pärtĭ-kəl, ăntī-
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A subatomic particle, such as a positron or antiproton, having the same spin, magnitude of electric charge, magnitude of magnetic moment, mass, and mean lifetime as the particle to which it corresponds, but the opposite sign of charge, opposite direction of magnetic moment, and opposite intrinsic parity.
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Any of the constituent particles of antimatter.
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A subatomic particle, such as an antiproton, having the same mass as its corresponding particle, but opposite values of other properties such as charge, parity, spin, and direction of magnetic moment. For example, the antiparticle of the electron is the positron, which has a charge that is equal in magnitude to that of the electron but opposite in sign. Some particles, such as photons, are nondistinct from their antiparticles. When a particle and its antiparticle collide, they may annihilate one other and produce other particles.
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(physics) A subatomic particle corresponding to another particle with the same mass, spin and mean lifetime but with charge, parity, strangeness and other quantum numbers flipped in sign.
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Origin of antiparticle