seat·mate 
(sētmāt′)
(sētmāt′)n.
A person sitting next to another on a conveyance such as an airplane: "His seatmate was a gray-haired woman with glasses" (Anne Tyler).
- multiform
- multiformity
- multigenerational
- multigrain
- multigravida
- multilane
- multilateral
- multilateralism
- multilateralist
- multilaterally
- multilayered
- multilevel
- multilingual
- multilingualism
- multilocular
- multimedia
- multimeter
- multimillionaire
- multinational
- multinationalism
- multinomial
- multinomial theorem
- multinuclear
- multinucleate
- multinucleated