Definition of subvassalage in US English:

subvassalage

noun

historical
  • Originally: †an estate or fief held by a subvassal (obsolete). Later: the state or condition of being a subvassal. Now chiefly: = subinfeudation.

Origin

Mid 18th century; earliest use found in Patrick Murdoch (d. 1774), Church of England clergyman and writer. From sub- + vassalage, originally after German Afterlehn, in later use after subvassal.

Pronunciation

subvassalage

/ˌsʌbˈvas(ə)lɪdʒ/