noun Date: 1724 the chief officer of a principal lodge in various fraternal orders (as Freemasonry), an expert player (as of chess) who has consistently scored high in international competition
GRAND MASTER
Meaning of GRAND MASTER in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012