Definition of ealdordom in US English:

ealdordom

(also aldordom)

noun

historical
  • 1Lordship, chief authority; = "aldership". Now rare.

  • 2The position, rank, or office of an ealdorman.

Origin

Old English; earliest use found in King Alfred (c848–899), king of the West Saxons and of the Anglo-Saxons. From alder + -dom.