- Belief in, or support for, the theory of extropy.
- Coordinate term: posthumanism
- 2004, Malcolm Miles, Tim Hall, Iain Borden, The City Cultures Reader, Psychology Press (→ISBN), page 238:
- The main tenets of Extropianism are ‘boundless expansion, self-transformation, dynamic optimism, intelligent technology, and spontaneous order’. The goal of Extropianism is to enable those who want to be at the vanguard of the incumbent transformation into a ‘posthuman’ age.