An Etymological Dictionary of Astronomy and Astrophysics

1. Any system or mode of thought or action in which human interests, values, and dignity predominate (dictionary.com).
   

2. Philo.: A variety of ethical theory and practice that emphasizes reason, scientific inquiry, and human fulfillment in the natural world and often rejects the importance of belief in God (dictionary.com).

See also: → human + → -ism.