diallelous

English

Etymology

diallel +‎ -ous

Adjective

diallelous (comparative more diallelous, superlative most diallelous)

1. (philosophy) Involving circular reasoning.

   Saying skydiving is unsafe because it's dangerous and then saying it's dangerous because it's unsafe is diallelous.

   • 1878, Francis Garden, A Dictionary of English Philosophical Terms, page 46:

     Diallelous. […] What is generally called defining reasoning in a circle.