How do you define exclusive when it comes to games?

[Eric2048]

If a game is only available for one family of consoles it's an exclusive. (Persona 5: PS4/PS3, Zelda BOTW Wii U/Switch).

If a game is available for only one family of consoles and PC it's a console exclusive, because it's not on any other type of consoles. (Nier Automata PS4/PC)