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seatmate

[seet-meyt]
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noun
  1. a person who shares a seat or occupies the seat next to oneself on a bus, plane, etc.
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Origin of seatmate

An Americanism dating back to 1855–60; seat + mate1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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