n.
A member of a group of people who have no fixed home and move according to the seasons from place to place in search of food, water, and grazing land.
A person with no fixed residence who roams about; a wanderer.
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[French nomade, from Latin nomas, nomad-, from Greek nomas, wandering in search of pasture. See nem- in Indo-European Roots.
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no·madic adj.
no·madi·cal·ly adv.
nomadism n.
Source: The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2000 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Obviously, the alien name Nomads is a remnant of the original story: an alien race that wanders from star system to star system to loot and destroy. If I remember correctly, that was also mentioned in the original intro movie.