Definition of seatmate noun from the Oxford Advanced Learner's Dictionary

 

seatmate

 noun
noun
BrE BrE//ˈsiːtmeɪt//
 
; NAmE NAmE//ˈsiːtmeɪt//
 
 
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a person that you sit next to when you are travelling, especially on a plane
See the Oxford Advanced American Dictionary entry: seatmate