Is Bastion an indie game? What does "indie game" mean anyway?

Indie is determined by the style of the game.
I'd consider Bastion "indie".

indie games are games that are fully financed by the developer.. that means that dev is also publisher, or that publisher gave no money to dev..

http://en.wikipedia.org/wiki/Indie_game

"There is no exact widely-accepted definition of what constitutes an "indie game". However, generally indie games share certain commonalities. Indie games are developed by individuals, small teams, or small independent companies. And, typically, indie games are smaller than mainstream titles. Indie game developers are not financially backed by publishers and usually have little to no budget available, thereby generally relying on Internet digital distribution schemes."

What does "indie game" mean anyway?

thats a good quiestion =P

i think that if u have something to do with the AAA u are not and indie developer

bastion was made by a team of around 7 people without studio help. yea its an indie.

you are expecting a serious discussion out of this 14 year old infested forums?

Try a more serious game dev forums like polycount or gammasutra..

quoting wikipedia:

"The game was created over almost two years by the team, who funded the development themselves."

Bastion was developed independently, as far as I know and only got a publisher post production or near the end of it. I would definitely count it indie. There really isn't any strict definition of the term.