Nomadic Empire
Concept · Empire · Stellaris 4.5.2
Nomadic Empire (empire) in the Stellaris encyclopedia: Nomadic Empires are civilizations that operate from mobile Arkships rather than stationary Colonies. They do not claim Systems or colonize Planets.
Nomadic Empire in the game's words
The encyclopedia entry as the game shows it in its tooltips; underlined words open their own entry or page here.
Nomadic Empires are civilizations that operate from mobile 
Arkships rather than stationary 
Colonies. They do not claim 
Systems or colonize 
Planets.
Nomadic Empires can build 
Waystations to collect resources, and can accept 
Contracts from Settled Empires.
Entries that mention Nomadic Empire
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Source: common/game_concepts (concept_nomadic_empire, also concept_nomadic_empires) and localisation/english, Stellaris Cygnus v4.5.2 (9776).