different between posthumanism vs transhumanism

English

post- +? humanism

posthumanism (countable and uncountable, plural posthumanisms)

(philosophy) Any of various schools of thought that oppose the earlier humanism.
transhumanism

From trans- +? humanism, coined by Julian Huxley in 1957.

transhumanism (countable and uncountable, plural transhumanisms)

A philosophy favouring the use of science and technology, especially neurotechnology, biotechnology, and nanotechnology, to overcome human limitations and improve the human condition.
- 2011, Braden R. Allenby, Daniel Sarewitz, The Techno-Human Condition, MIT Press (?ISBN), page 87:
  Those who favor transhumanism speak the language of individual choice and freedom from institutional authoritarianism; those who challenge it speak the language of human dignity and human nature as embodied in the individual.

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