
• (n.) The vassal or tenant of a baron; one who held under a baron, and who also had tenants under him; one in dignity next to a baron; a title of dignity next to a baron.
Found on
http://thinkexist.com/dictionary/meaning/vavasor/
Vav'a·sor noun [ Middle English
vavasour , Old French
vavassor ,
vavassour , French
vavasseur , Late Latin
vavassor , probably contr. from
vassus vassorum vassal of the vassals. See
Vassal .]
(Feud. Law) The vassal or tenant of a baron; one wh...
Found on
http://www.encyclo.co.uk/webster/V/10

In the feudal system, vavasor was a term applied to various kinds of vassals, sometimes for a class below barons or tenants-in-chief, and above knights.
Found on
http://www.probertencyclopaedia.com/browse/CXV.HTM
No exact match found.