an·​ti·​lepton | \ " +\

Definition of antilepton

: an antiparticle (such as a positron or an antineutrino) of a lepton

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First Known Use of antilepton

1959, in the meaning defined above

History and Etymology for antilepton

anti- entry 1 + lepton entry 3

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The first known use of antilepton was in 1959

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