Usage: capitalized M&F
: French as exhibited in manuscripts of the 14th to 16th centuries — see indo-european languages table
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the French language of the 14th, 15th, and 16th centuries. Abbr.: MF
[1885-90]
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Middle French,
the French language from about 1400 to about 1600. Abbr: MF (no periods).
Useful english dictionary. 2012.