vav·a·sor also vav·a·sour (vāv'ə-sôr', -sōr', -sŏŏr') n. A feudal tenant who ranked directly below a baron or peer.
[Middle English vavasour, from Old French, from Medieval Latin vavassor, possibly contraction of vassus vassōrum, vassal of vassals : vassus, vassal (from Vulgar Latin *vassus; see vassal) + vassōrum, genitive pl. of vassus, vassal.]