different between milling vs reprocessing

English

milling (countable and uncountable, plural millings)

A grinding process using a mill.
The series of notches around the edge of a coin, placed there during minting so that it can be told if some of the metal from the edge is removed. Removing metal from a coin was common practice during earlier times when coins made of precious metals circulated.
A circular or random motion of a herd or a crowd.

milling

reprocessing

reprocessing (plural reprocessings)

A second or subsequent processing.
1. (engineering, nuclear physics) The process of extracting useful or valuable materials from used nuclear fuel, mainly focusing on the recovery of fissile and fertile material (primarily uranium and plutonium, and sometimes thorium as well) for use in fresh nuclear reactor fuel, or, in some cases, the manufacture of nuclear weapons (although recovery of precious metals produced by nuclear fission has also been studied).

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