Etymology
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bystander (n.)

"spectator, one who stands near," 1610s, from by + agent noun from stand (v.). They have been innocent at least since 1829. Stander-by is from 1540s.

updated on September 07, 2017

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Definitions of bystander from WordNet

bystander (n.)
a nonparticipant spectator;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.