Noun
The chief executive of the national mint corporation in charge of coining coinage of legal coin tender.
(chiefly historical) Synonym of moneyer, the master of a regional mint.
Source: en.wiktionary.orgThe knighthood is likely to have been motivated by political considerations connected with the Parliamentary election in May 1705, rather than any recognition of Newton's scientific work or services as Master of the Mint. Source: Internet