Definition of "slot machine"

Any machine operated by placing a coin or token into a slot, especially

1. (chiefly US, UK) A machine so operated to play games of chance for money, especially those with a lever and three or more rollers used to achieve combinations.  quotations  examples

   Quotations

   • As an illustration of a general technique for calculating odds, suppose you are playing a 25-cent slot machine.

     2005, Benjamin Crowell, The Modern Revolution in Physics

2. Synonym of vending machine.  quotations  examples

   Quotations

   • The paperback selling slot-machine was only one resourceful trade invention, […]

     1998, Eva Hemmungs Wirtén, Global Infatuation: explorations in transnational publishing and texts