from Wiktionary, Creative Commons Attribution/Share-Alike License
- proper n. A puzzle video game in which falling tetrominoes must be manipulated to form complete lines, which are then cleared from the grid.
- n. The act of clearing four lines at once (the maximum possible) in Tetris.
- n. An endeavor involving rearranging things of different shape into a physical space.
From Russian Тетрис (Tétris), coined by the creator of the game, Alexey Pajitnov, from the Greek numerical prefix тетра- ("tetra-") (as all of the game's pieces contain four segments) and теннис ("tennis"), his favourite sport. (Wiktionary)