World (Bubble, Sponge-world): an isolated stable territory where game events take plaņe. During the game the amount of explored worlds grows. Such combined system of Bubbles is called the Worlds' Chain.
Corridor: In the general meaning it is a connection between worlds. With the help of such Corridors you can momentary travel to another world. On the psychical level it is a portal connection made out of alpha- and omega-Corridors, in other words, portals connected to a particular world. Crossing the Corridor means great energy losses. Portal building and energy accumulation can last for years.
Frame: a mobile city-ship, a mothership analogue. The whole civilization travels through the World's Chain in these huge constructions. The Exodus history is a history of Frames moving from one world to another and fighting with each other.
Testament: Traveling through worlds takes time. Frames don't usually appear at one world simultaneously. For intercourse purposes they use powerful impulses that can spread around a part of the Worlds' Chain and deliver information. Preparation of such impulse is an expensive procedure. Therefore they are sent rarely. It usually happens before an expedition to a new, unexplored world. Since Exodus is a dangerous journey each communication can be the last one. That's why they are called Testaments sent to other Frames. Such communications contain not only information about exploration but countenance as well.
Zero-level: The energy level of the surface. This level can be reached with the help of terraforming units. Used for energy extraction.