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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

causal agent, cause, causal agency go
any entity that produces an effect or is responsible for events or results

agent go
an active and efficient cause

vector, transmitter go
any agent (person or animal or microorganism) that carries and transmits a disease

carrier, immune carrier
(medicine) a person (or animal) who has some pathogen to which he is immune but who can pass it on to others

noun.person

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