Etymology
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endgame (n.)

also end-game, 1850, in chess, from end + game (n.). There is no formal or exact definition of it in chess, but it begins when most of the pieces have been cleared from the board.

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Definitions of endgame

endgame (n.)
the final stages of an extended process of negotiation;
the diplomatic endgame
Synonyms: end game
endgame (n.)
the final stages of a chess game after most of the pieces have been removed from the board;
Synonyms: end game
From wordnet.princeton.edu