The definition of transhumanism used by the World Transhumanist Association is: an advocacy, for the ethical use of technology to extend human capabilities.
For religious transhumanists, the operative word is ethical.
Some early writers:
J. B. S. Haldane (1892-1964) Daedalus: Science and the Future, 1923 http://bactra.org/Daedalus.html
J. D. Bernal (1901-1971) The World, the Flesh and the Devil, 1929 http://www.quarkweb.com/foyle/WorldFleshDevil.pdf
W. D. Lighthall (1857-1954) The Law of Cosmic Evolutionary Adaptation: An Interpretation of Recent Thought, 1940, discussed in, Peter Harrison & Joseph Wolyniak, The History of ‘Transhumanism’. Notes and Queries 62, 2015, 465–7 https://doi.org/10.1093/notesj/gjv080
Julian Huxley (1887-1975) Transhumanism, in, New Bottles for New Wine, London: Chatto & Windus, 1957, pp. 13-17 https://web.archive.org/web/20160625132722/http://www.transhumanism.org/index.php/WTA/more/huxley
Marvin Minsky (1927-2016) Steps Toward Artificial Intelligence, 1960. http://courses.csail.mit.edu/6.803/pdf/steps.pdf
I. J. Good (1916-2009) Speculations Concerning the First Ultraintelligent Machine, Advances in Computers, vol. 6, 1965. https://web.archive.org/web/20111128085512/http://commonsenseatheism.com/wp-content/uploads/2011/02/Good-Speculations-Concerning-the-First-Ultraintelligent-Machine.pdf
Note: This post was intended to be a chronology of Transhumanism. It was originally written 2018-07-11 and saved at 20h13m36s. It is published in this inferior state to acknowledge that the topic is no longer being prioritized by this writer, and to encourage others, who may have an interest in the subject, to create related, but more interesting, in-depth weblog posts.
A tidbit is can be defined as: 1: a choice morsel of food. This usage dates from about 1640; 2: a choice or pleasing bit (as of information). In this weblog, tidbits will refer to shorter draft posts, that have been awaiting editing and expansion for at least six (6) months.