Supreme mastery or skill; the greatest possible achievement in a particular art, craft, or discipline.
From 'arch-' (chief, supreme) plus 'mastery.' A rare literary term from 16th-17th century English rhetoric, used to describe unparalleled excellence or expertise.
This word captures that Renaissance idea of a 'master of masters'—when someone was so skilled they transcended being merely 'master' and became the archmaster of their field, it was the ultimate compliment.
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