What is a casual game?

[Zlejedi]

TruckOSaurus said:

New Super Mario Bros., Nintendogs, Mario Kart DS, Brain Age: Train Your Brain in Minutes a Day, Pokémon Diamond / Pearl for DS

Super Mario 3D Land, Mario Kart 7, The Legend of Zelda: Ocarina of Time 3D, Nintendogs + cats, Monster Hunter 3G for 3DS

So I’m asking guys, what is YOUR definition of a casual game? Does it include only party games, mini-game collections, educational and fitness games? Or does any game with accessible gameplay qualifies as casual? Does being family friendly tip the scale? Is it the number of hours required to finish it that determine its status? Are you required to have guns in a game to make it hardcore? Enlighten me VGChartz!

I've bolded those which I consider casual.

For me a casual game are all those mini-game collections, party games, edution and fitness.