#1 agent n. an active and efficient cause; capable of producing a certain effect; "their research uncovered new disease agents". wn
#2 agent n. a representative who acts on behalf of other persons or organizations. wn
#3 agent n. a substance that exerts some force or effect. wn
#4 agent n. [factor, broker] a businessman who buys or sells for another in exchange for a commission. wn
#5 agent n. [federal agent] any agent or representative of a federal agency or bureau. wn
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