a surrounding or nearby region; "the plane crashed in the vicinity of Asheville"; "it is a rugged locality"; "he always blames someone else in the immediate neighborhood"; "I will drop in on you the next time I am in this neck of the woods"
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; "Kasparov checkmated his opponent after only a few moves"