Etymology
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mo

representing African-American vernacular pronunciation of more, by 1902; it was an acceptable variant form of more in the Middle Ages and has roots in Old English; see more.

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Definitions of mo
1
mo (n.)
an indefinitely short time;
in a mo
Synonyms: moment / minute / second / bit
mo (n.)
a midwestern state in central United States; a border state during the American Civil War, Missouri was admitted to the Confederacy without actually seceding from the Union;
Synonyms: Missouri / Show Me State / Mo.
2
Mo (n.)
a polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel;
Synonyms: molybdenum / atomic number "
From wordnet.princeton.edu