Definition of hereditary lands in US English:

hereditary lands

noun

historical
  • Those countries or provinces which formed the original inheritance of the Habsburg dynasty (which ruled in Austria from 1278 to 1918), and (frequently also) some of those acquired later by the Habsburgs by marriage.

Origin

Mid 16th century. After German (now hist.) Erblande, plural of Erbland, specific use of Erbland native country, homeland.