What's the difference between tricliniary and triclinium?

Tricliniary

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Definition:

• (a.) Of or pertaining to a triclinium, or to the ancient mode of reclining at table.

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Triclinium

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Definition:

• (n.) A couch for reclining at meals, extending round three sides of a table, and usually in three parts.
• (n.) A dining room furnished with such a triple couch.

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