Etymology
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defender (n.)

c. 1300, defendour, "one who protects from injury a champion" (early 13c. as a surname), via Anglo-French from Old French defendeor, agent noun from defendre (see defend). The Latin word in this sense was defensor.

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Definitions of defender

defender (n.)
a person who cares for persons or property;
Synonyms: guardian / protector / shielder
defender (n.)
a fighter who holds out against attack;
Synonyms: withstander
From wordnet.princeton.edu