2 definitions
for lepton
From The Collaborative International Dictionary of English v.0.48 :
lepton \lepton\ n. (Physics)
an elementary particle that participates in weak interactions
but does not participate in the strong interaction; it has a
baryon number of 0. Some known leptons are the electron,
the negative muon, the tau-minus particle, and the
neutrinos associated with each of these particles.
[WordNet 1.5 +PJC]
From WordNet (r) 2.0 :
lepton
n 1: 100 lepta equal 1 drachma
2: an elementary particle that participates in weak
interactions; has a baryon number of 0
[also: lepta (pl)]