Etymology
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IRS

also I.R.S., initialism (acronym) of Internal Revenue Service, U.S. federal government tax collection agency, attested by 1954. The office dates to 1862; name changed 1953 from Bureau of Internal Revenue.

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Definitions of IRS

irs (n.)
the bureau of the Treasury Department responsible for tax collections;
Synonyms: Internal Revenue Service
From wordnet.princeton.edu