diallelous

English

Etymology

From 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.