What is Horizon in Horizon: Zero Dawn?
Solution 1:
The lead writer of Horizon: Zero Dawn, Ben McCaw, commented on this during a Q&A session on Reddit. The choosing of the word "Horizon" was to lay down the setting of a new world to be discovered
"For us, “Horizon” represents a boundless new world, and also the passage of time (where the Sun rises and sets) that is so fundamental to the setting and story."