This is an official definition authorised by the Astronist Institution. Click here for this definition's page on



noun | [mass noun]

1. disbelief or lack of belief in the astronal, spiritual, or philosophical capacities of the astronomical world.

2. denial of one or more of the fundamental tenets or dogmas of Astronism, especially cosmocentrism or astrothanasia.


  • Acosmist | ˈeɪkɒzmɪst | adjective & noun
  • Acosmistic | ˈeɪkɒzmɪstɪk | adjective
  • Acosmistically | ˈeɪkɒzmɪstɪk(ə)li | adverb

Origin and etymology

  • Astro-English: from Astronese, the prefix a-, denoting negation, adjoined to the word cosmism denoting belief in the spiritual and astronal capacities of the astronomical world; meaning ‘without the astronomical world.’
Community content is available under CC-BY-SA unless otherwise noted.