One of the mysteries of the English language finally explained.
1Positively; affirmatively. rare.
2In a way capable of being affirmed; demonstrably.
Late 15th century; earliest use found in William Caxton (1415x24–1492), printer, merchant, and diplomat. Originally from post-classical Latin affirmabilis affirmable + -ly, after Middle French afferméement. In later use from affirmable + -ly.
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