noun
vassal
VAS-ul/ˈvæsl/
A person or state subject to a more powerful ruler or authority.
The vassal pledges loyalty with joined hands before the lord.

Etymology
Vassallus meant a manservant or retainer. The service relationship became the feudal role of a tenant pledging loyalty to a lord, underlying the broader sense of a subordinate bound to a superior.
In context
he made himself vassal to the Abbey and held his land from it.
More examples
- The emperor treats neighboring states as vassals.
- As a vassal state, the country cannot conduct its own foreign policy.
- The governor resents being treated as a vassal of the president.
Forms
vassal · vassals
vassalage noun — The condition of being a vassal.
Similar words
- subject
- Subject emphasizes allegiance to a ruler rather than dependence.
- subordinate
- Subordinate applies broadly to someone of lower rank or authority.