Both terms are fine, it doesn't really matter which one you pick. If something changes in whatever object or concept (as in something like the concept of time), it will revert it back to its original state.

Can you reset infinity?

Follow the directions below to reset your Figure: ​Select Options from the Main Menu. Choose Game Options. Select Reset Figure.

Can Giorno reset anything to zero?

As seen in part 6, Pucci was able to reset universe without getting intervened by GER. This proves that Giorno cannot redo something he isn't aware of thus he'll be effected by that. ... You can't benefit from it in direct combat, any action you take against Giorno will be reverted.