Plural of Arcadia; referring to multiple idealized pastoral settings or versions of Arcadia, literal or imaginary.
From Arcadia (Greek Arkadia) + the plural suffix -s. While Arcadia historically referred to one region, the plural accommodates multiple fictional or metaphorical Arcadias in literature and art.
Different authors basically invented their own Arcadias—Italian writers created one version, French poets another, Spanish playwrights yet another—so you ended up with dozens of imaginary perfect worlds all called 'Arcadia' existing simultaneously in European culture.
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