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.