What does 'mate in one' mean in chess? Apparently, I've done it

No way chess.com gave me a blunder on this : r/GothamChess

Decision making in critical positions - Chess Forums

Ultimate Chess Glossary & Chess Terms (+300) - Alberto Chueca - High Performance Chess Academy

Why is the final move after checkmate not played? - Quora

Heres an exercise from a book I've been reading. The text said that Alekhine announced mate in 10 from this position in a simultaneous display. White to move, find the longest variation. : r/chess

How Is This Mate In 1? ♖ Tough Chess LOGIC Puzzle ♖ Chess Logic Puzzle

Mate in 5 I saw while watching a game between GMs (the GM didn't see, game in the first comment) : r/chess

Apparently forced mate is brilliant now? : r/chessbeginners

Hardest mate in 2 I've ever seen, from a game I just played. : r/chess

What does 'mate in one' mean in chess? Apparently, I've done it many times since my buddy keeps telling me it's my favorite checkmate move? - Quora

What does 'mate in one' mean in chess? Apparently, I've done it many times since my buddy keeps telling me it's my favorite checkmate move? - Quora

How do I save particular variants (lines of play) included in an analysis to a PNG? - Chess Forums