Etymology
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supporter (n.)

early 15c., "adherent, partisan," agent noun from support (v.). Meaning "that which supports" is from 1590s.

updated on December 30, 2013

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Definitions of supporter from WordNet

supporter (n.)
a person who backs a politician or a team etc.;
all their supporters came out for the game
supporter (n.)
someone who supports or champions something;
Synonyms: patron / sponsor
supporter (n.)
a person who contributes to the fulfillment of a need or furtherance of an effort or purpose;
Synonyms: assistant / helper / help
supporter (n.)
a band (usually elastic) worn around the leg to hold up a stocking (or around the arm to hold up a sleeve);
Synonyms: garter
supporter (n.)
a support for the genitals worn by men engaging in strenuous exercise;
Synonyms: athletic supporter / suspensor / jockstrap / jock
From wordnet.princeton.edu, not affiliated with etymonline.