Koinon

Rarity: Common

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What Wikipedia says

Koinon (Greek: Κοινόν, pl. Κοινά, Koina), meaning "common thing", in the sense of "public", had many applications, some societal, some governmental. An abstract noun formed from the neuter of the adjective, koinos, "common", the koinon could mean any sort of organization.

Excerpt from the Wikipedia article “Koinon”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: H. Thurston Peck, art. Aphrodite, in H. Thurston Peck, Harpers Dictionary of Classical Antiquities, New York, 1898, p. 39., Public domain, via Wikimedia Commons.