Video Game Arcade
"Arcade Game" is a shorthand term to describe the type of video game found in a Video Game Arcade.
Arcade Video Games are a type of Video Game set up in large cabinets or electronic simulation devices, placed in an Arcade along with other attractions such as Ski-Ball games, Pinball Games, and Crane Games.
These Arcade Video Games, like other Arcade attractions, are coin-operated and have gameplay that incorporates the coin-operated nature of the game. Some traits of an Arcade Video Game include a "Lives" system which can be extended by the player by adding additional coins, or a second set of controls built into the machine for a second player (either as a co-operative player or as another opponent). Other attributes include an "attract" mode (a demo of the game), advancing or repeating video game 'levels', and a high score system that displays while in "attract" mode.
Many of these Arcade Video Games were later ported to home consoles and retained a number of these attributes as part of their gameplay. This is why they are still called "Arcade Games", where other games that were developed and intended to be played on a home console or computer are not considered Arcade Games.
This definition has not changed - but in modern console days, many games have come out that do not follow these Arcade Game conventions - to the point where those that still do are considered a genre of their own.