Spacious

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late Middle English: from Old French spacios or Latin spatiosus, from spatium (see space).

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From Old French spacios, from Latin spatiosus.

etymonline

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spacious (adj.)

late 14c., from Old French spacios, espacios "roomy, spacious, extensive" (12c., Modern French spacieux), or directly from Latin spatiosus "roomy, ample" (Medieval Latin spaciosus), from spatium "room, space" (see space (n.)). Related: Spaciously; spaciousness.