Definition of post office
1
: a government department or agency handling the transmission of mail
2
: a local branch of a national post office handling the mail for a particular place or area
3
: a game in which a player acting as postmaster or postmistress may exact a kiss from one of the opposite sex as payment for the pretended delivery of a letter
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Merriam-Webster unabridged
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The first known use of post office was in 1652
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