Etymology
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badge (n.)

"token worn to indicate the wearer's occupation, preference, etc.," especially "device worn by servants or followers to indicate their allegiance," from Anglo-French bage (mid-14c.) or Anglo-Latin bagis, plural of bagia "emblem," all of unknown origin. Figurative sense "mark or token" of anything is by 1520s.

updated on March 29, 2017

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Definitions of badge from WordNet
1
badge (n.)
an emblem (a small piece of plastic or cloth or metal) that signifies your status (rank or membership or affiliation etc.);
they checked everyone's badge before letting them in
badge (n.)
any feature that is regarded as a sign of status (a particular power or quality or rank);
wearing a tie was regarded as a badge of respectability
2
badge (v.)
put a badge on;
The workers here must be badged
From wordnet.princeton.edu, not affiliated with etymonline.