The phrase "alternate ending" means an alternative or different version of how a story or movie could conclude. It is a different way that the events could play out, giving viewers or readers a different outcome or resolution. Full definition
The first Blu - ray comes with the new extended cut with alternate ending on its own Blu - ray. (mediamikes.com)
As for the extras, I'm thankful they chose the ending they did and not the dreadful alternate ending on the special features. (crunchonthis.com)
Likewise, rather than just have the game end early if you make the wrong choices in certain dialogue sequences, why not have alternate ending sequences all together? (zeboyd.com)