Etymology
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milling (n.)

mid-15c., "act or business of grinding (grain) in a mill," verbal noun from mill (v.1). In reference to shaping metals by 1610s; in coin-making by 1817.

updated on January 19, 2019

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Definitions of milling from WordNet

milling (n.)
corrugated edge of a coin;
From wordnet.princeton.edu, not affiliated with etymonline.