D defs.my
Entry 2 senses Webster, 1913

Imperatorial

/(ĭm*pĕr`ȧ*tō"rĭ*val)/ · Im·per·a·to·ri·al · IPA
01 a. Commanding; imperative; authoritative.
  1. 1.
    Commanding; imperative; authoritative.
  2. 2.
    Of or pertaining to the title or office of imperator.