Source : Webster's Revised Unabridged Dictionary (1913)

Titular \Tit"u*lar\, a. [F. titulaire, fr. L. titulus. See
   {Title}.]
   Existing in title or name only; nominal; having the title to
   an office or dignity without discharging its appropriate
   duties; as, a titular prince.

         If these magnificent titles yet remain Not merely
         titular.                                 --Milton.

   {Titular bishop}. See under {Bishop}.

Titular \Tit"u*lar\, n.
   A titulary. [R.]

Source : WordNet®

titular
     adj 1: of or relating to a legal title to something; "titulary
            rights" [syn: {titulary}]
     2: of or associated with or bearing a title signifying
        nobility; "of titular rank"
     3: derived from a title; "performed well in the titular (or
        title) role"; "the titular theme of the book"
     4: of or associated with or bearing a title signifying status
        or function; "titular dignitaries"
     5: being such in name only; "the nominal (or titular) head of
        his party" [syn: {nominal}]