Etymology
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ante meridiem 
"of morning, before mid-day," 1560s, Latin, literally "before noon," from ante "before" (from PIE root *ant- "front, forehead," with derivatives meaning "in front of, before") + accusative of meridies "midday, noon" (see meridian). Adjective antemeridian is attested from 1650s.
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Marie Antoinette 

(1755-1793), queen consort of Louis XVI; as the name for a decorative style of France in that period, by 1887. She likely did not say "let them eat cake" (see cake (n.)). The city of Marietta, Ohio, U.S., founded in 1788, was named for her in honor of Louis XVI's financial support of the American Revolution.

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