What is a defeat called in chess?

Answer 1

Depends on how you won.

If you checked your opponent's king and he cannot block the check, capture the checking piece, or move his king away, you win by checkmate.

If your opponent tips his king over and says "I resign" You win by resignation.

If your opponent runs out of time in his/her clock, you win by time.

If your opponent is 30+min. late, you win by "no-show".

Answer 2

Check Mate.

Answer 3

Checkmate