finalbutton
nounUK /ˈfaɪ.nəl ˈbʌt.ən/
US /ˈfaɪ.nəl ˈbʌt.ən/
The last button you press to finish something.
Press the finalbutton to send your message.
OTHER MEANINGS
2. The last button in a row or sequence.
The finalbutton on the remote turns off the TV.
3. A button that ends a game or level.
Hit the finalbutton to win the game.
4. A button pressed at the very end of a process.
The finalbutton saves all your work.