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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

object, physical object go
a tangible and visible entity

whole, unit go
an assemblage of parts that is regarded as a single entity

natural object go
an object occurring naturally

body go
an individual 3-dimensional object that has mass and that is distinguishable from other objects

particle, subatomic particle go
a body having finite mass and internal structure but negligible dimensions

elementary particle, fundamental particle go
(physics) a particle that is less complex than an atom

lepton
an elementary particle that participates in weak interactions

noun.object

4 Subcategories

electron, negatron go
an elementary particle with negative charge
muon, negative muon, mu-meson go
an elementary particle with a negative charge and a half-life of 2 microsecond
neutrino go
an elementary particle with zero charge and zero mass
tauon, tau-minus particle go
a lepton of very great mass