From Lexicanum

A γ-class² or civilised world is a classification of planet type in the Imperium.

Of all the types of settlement in the Imperium, civilised worlds are the most common (although the term "civilised" here refers to their urban landscapes rather than to any pretence of social decorum³.) On these self-sufficient worlds, the main population centres tend to be large cities or other urban environments that are supported by the planet's own agricultural production. The state of development both technologically and socially varies, but is most commonly around the current Imperial norm. Most adjuncts of the Imperial state will normally have a presence on the planet¹. By the classification guidelines, a civilised world has a population from 15,000,000 to 10,000,000,000 and pays tithes between Solutio Extremis and Exactis Tertius².

Subtypes of Civilised World²

• Cardinal World (cc)
• Garden World (cg)
• Mining World (cm)

Notable Civilised Worlds

• Cyrene (sentenced to Exterminatus)
• Espandor (destroyed by Tyranids)
• Gudrun (capital of the Helican subsector)
• Jouran (founding world of the Jouran Dragoons)
• Luxor
• Rhanda
• Sixty-Three-Nineteen (originally called Terra)
• Tallarn²
• Korsk II

Sources

• ¹:Warhammer 40,000: Rogue Trader p.134
• ²:Warhammer 40,000 3rd Edition Rulebook p. 114
• ³:WD140, Galactic Civilisation

Worlds of the Galaxy

Imperium	Adeptus Astartes Homeworld • Agri World • Cardinal World • Civilised World • Dead World • Death World • Desert World • Feral World • Feudal World • Forge World • Hive World • Ice World • Industrial World • Jungle World • Knight World • Mining World • Ocean World • Paradise World • Penal World • Research Station • Shrine World
Xeno	Xenos World • Daemon World • Exodite World • Tomb World • Maiden World • Crone World • Ork World • Tau Empire • Craftworld