Definitions For Checkmate

A chess move constituting an inescapable and indefensible attack on the opponent's king
Complete victory

Place an opponent's king under an attack from which it cannot escape and thus ending the game
A situation in chess in which a player loses the game because that player's king is in a position from which it cannot escape

Is Checkmate a Scrabble Word?

Words With Friends YES

Scrabble US YES

Scrabble UK YES

English International (SOWPODS) YES

Scrabble Global YES

Enable1 Dictionary YES

Scrabble

Words with Friends

The word Checkmate is worth 22 points in Scrabble and 24 points in Words with Friends

Finally checkmated the billionaire in his attempt to take over the movie studio
A brilliant move that resulted in checkmate
The challenger can force a checkmate with his next move.