corresponding member of a society

from The Collaborative International Dictionary of English v.0.48

Corresponding \Cor`re*spond"ing\, a.
   1. Answering; conformable; agreeing; suiting; as,
      corresponding numbers.
      [1913 Webster]

   2. Carrying on intercourse by letters.
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   {Corresponding member of a society}, one residing at a
      distance, who has been invited to correspond with the
      society, and aid in carrying out its designs without
      taking part in its management.
      [1913 Webster]