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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
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physical entity go
an entity that has physical existence
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matter go
that which has mass and occupies space
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substance go
a particular kind or species of matter with uniform properties
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antigen go
any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies)
Rh, rhesus factor, Rh factor
a blood group antigen possessed by Rh-positive people
noun.substance

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