Source : Webster's Revised Unabridged Dictionary (1913)

Prominence \Prom"i*nence\, Prominency \Prom"i*nen*cy\, n. [L.
   prominentia: cf. F. prominence. See {Prominent}. ]
   1. The quality or state of being prominent; a standing out
      from something; conspicuousness.

   2. That which is prominent; a protuberance.

   {Solar prominences}. (Astron.) See {Solar Protuberances},
      under {Protuberance}.

Source : WordNet®

prominence
     n 1: the state of being prominent: widely known or eminent [ant:
          {obscurity}]
     2: relative importance
     3: something that bulges out or is protuberant or projects from
        a form [syn: {bulge}, {bump}, {hump}, {gibbosity}, {gibbousness},
         {jut}, {protuberance}, {protrusion}, {extrusion}, {excrescence}]