Source : Webster's Revised Unabridged Dictionary (1913)

Pleat \Pleat\ (pl[=e]t), n. & v. t.
   See {Plait}.

Source : WordNet®

pleat
     n : any of various types of fold formed by doubling fabric back
         upon itself and then pressing or stitching into shape
         [syn: {plait}]
     v 1: pleat or gather into a ruffle; "ruffle the curtain fabric"
          [syn: {ruffle}]
     2: fold into pleats, "Pleat the cloth" [syn: {plicate}]