Source : Webster's Revised Unabridged Dictionary (1913)

Annotate \An"no*tate\, v. t. [imp. & p. p. {Annotated}; p. pr. &
   vb. n. {Annotating}.] [L. annotatus; p. p. of annotare to
   annotate; ad + notare to mark, nota mark. See {Note}, n.]
   To explain or criticize by notes; as, to annotate the works
   of Bacon.