The definition of public is something that is related to, available to or known by people.(adjective)
Public is ordinary people or people within a community.(noun)
All of the people in a given location are an example of the public.
See public in Webster's New World College Dictionary
Origin: ME < L publicus: altered (prob. infl. by pubes, adult) < poplicus, contr. of populicus, public < populus, the people
See public in American Heritage Dictionary 4
Origin: Middle English publik
Origin: , from Old French public
Origin: , from Latin pūblicus
Origin: , alteration (influenced by pūbēs, adult population)
Origin: of poplicus
Origin: , from populus, people
Origin: , of Etruscan origin.
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