Etymology
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agency (n.)

1650s, "active operation;" 1670s, "a mode of exerting power or producing effect," from Medieval Latin agentia, abstract noun from Latin agentem (nominative agens) "effective, powerful," present participle of agere "to set in motion, drive forward; to do, perform," figuratively "incite to action; keep in movement" (from PIE root *ag- "to drive, draw out or forth, move"). Meaning "establishment where business is done for another" first recorded 1861.

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Definitions of agency

agency (n.)
an administrative unit of government;
Synonyms: federal agency / government agency / bureau / office / authority
agency (n.)
a business or organization that provides a particular service, especially the mediation of transactions between two parties;
agency (n.)
the state of being in action or exerting power;
she has free agency
the agency of providence
agency (n.)
the state of serving as an official and authorized delegate or agent;
Synonyms: representation / delegacy
agency (n.)
thing or person that acts to produce a particular effect or achieve an end;
an example is the best agency of instruction
Synonyms: means / way
From wordnet.princeton.edu