Etymology
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grandmaster (n.)

as a chess title, 1927, from grand (adj.) in the sense "chief, principal" + master (n.). Earlier (as two words) a title in Freemasonry (1724) and in military orders of knighthood (1550s).

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Definitions of grandmaster

grandmaster (n.)
a player of exceptional or world class skill in chess or bridge;
From wordnet.princeton.edu