A vassal was someone in feudal times who received protection and land from a lord in return for allegiance and performing military and other duties. Today a vassal is someone who is subordinate. (noun)
An example of a vassal is a person who was given part of a lord's land and who pledged himself to that lord.
An example of a vassal is a subordinant or servant.
See vassal in Webster's New World College Dictionary
noun
in the Middle Ages, a person who held land under the feudal system, doing homage and pledging fealty to an overlord, and performing military or other duties in return for his protection; feudal tenant
a subordinate, subject, servant, slave, etc.
adjective
of or like a vassal; dependent, servile, etc.
being a vassal
See vassal in American Heritage Dictionary 4
(văsˈəl)
noun
A person who held land from a feudal lord and received protection in return for homage and allegiance.