A measure of intelligence, information, energy, life, experience, diversity, opportunity, and growth. The collection of forces which oppose entropy. See also Negentropism
- Extropia - Text by M. Alan Kazlev
 Interlinked Information to First Federation age evolving communities embodying extropian values. Included both virtual cultural communities and actual communities in several orbital free zones.
 Belt habitat of Extropist sect, Interplanetary Age to Nanotech Age.
- Extropian - Text by Anders Sandberg based on the term in his Transhumanist Terminology
One who affirms the values and attitudes codified and expressed in the Extropian Principles.
- Extropian Principles - Text by M. Alan Kazlev
The five values of Boundless Expansion, Self-Transformation, Dynamic Optimism, Intelligent Technology, and Spontaneous Order, which form the basis of the extropian memeticity.
- Extropism (religion) - Text by M. Alan Kazlev
Interplanetary Age religion, an extension of extropist philosophy, based on rigid application of Extropian Principles and worship of Max More as an avatar. Although the actual Max More turingrade upload and eir associated copies and ais vigorously denounced the movement, its leadership retained control through a selective isolation of the community in the Belt Habitat Extropia. The habitat, along with the few remaining members of the sect, were destroyed in the Technocalypse in 542.
- Extropolis - Text by Anders Sandberg
Extropian community located in Cis-Lunar orbit, late Information to Interplanetary period.
Text by Anders Sandberg in his Transhumanist Terminology
Initially published on 24 October 2001.