Source : Webster's Revised Unabridged Dictionary (1913)

Assertor \As*sert"or\, n. [L., fr. asserere.]
   One who asserts or avers; one who maintains or vindicates a
   claim or a right; an affirmer, supporter, or vindicator; a
   defender; an asserter.

         The assertors of liberty said not a word. --Macaulay.

         Faithful assertor of thy country's cause. --Prior.