a person who shares a seat or occupies the seat next to oneself on a bus, plane, etc.

1855–60, Americanism; seat + mate1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
If no other seats available, allay seatmate's concerns.
He is also a former seatmate of mine who tended to get us off-track over there
  in the corner.
But between seats is a five inch armrest, enough space so you can sit back
  straight without shoulders touching your seatmate.
Even the widest turn, however, can still get you a little cozy with your
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