D defs.my
Entry 2 senses Webster, 1913

Autocrat

/ôt'-ək-rătˌ/ · Au·to·crat · IPA /ˈɔːtəkɹæt/
01 n. An absolute sovereign; a monarch who holds and exercises the powers of government by claim of absolute right, not subject to restriction; a…
  1. 1.
    An absolute sovereign; a monarch who holds and exercises the powers of government by claim of absolute right, not subject to restriction; as, Autocrat of all the Russias (a title of the Czar).
  2. 2.
    One who rules with undisputed sway in any company or relation; a despot.
    “The autocrat of the breakfast table.” — Holmes.