Etymology
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pillion (n.)

kind of light, simple saddle, especially for women, c. 1500, of Celtic origin (compare Irish pillin, Gaelic pillin), ultimately from Latin pellis "skin, pelt" (from PIE root *pel- (3) "skin, hide"). Later also "adjustable pad or cushion behind a saddle as a seat for a second person, usually a woman."

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Definitions of pillion

pillion (n.)
a seat behind the rider of a horse or motorbike etc.;
From wordnet.princeton.edu