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The Collaborative International Dictionary
Imperatorial

Imperatorial \Im*per`a*to"ri*al\, a. [L. imperatorius.]

  1. Commanding; imperative; authoritative.

  2. Of or pertaining to the title or office of imperator. ``Imperatorial laurels.''
    --C. Merivale.

Wiktionary
imperatorial

a. 1 commanding; authoritative. 2 Relating to the title or office of imperator.