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the title of a representative of the higher nobility in Great Britain and France. The title first appeared in the Middle Ages. In France it was eliminated in 1789 but temporarily revived during the period from 1814 to 1848. In Great Britain the peerage still exists. Peers have the right to membership in the House of Lords.
To give a simple example, when two people talk to each other, the lowest layer is the physical layer which concerns the sound pressure waves travelling from mouth to ear (so mouths and ears are peers) the next layer might be the speech and hearing centres in the people's brains and the top layer their cerebellums or minds. Although, barring telepathy, nothing passes directly between the two minds, there is a peer-to-peer communication between them.