Source : Webster's Revised Unabridged Dictionary (1913)

Plait \Plait\, v. t. [imp. & p. p. {Plaited}; p. pr. & vb. n.
   {Plaiting}.]
   1. To fold; to double in narrow folds; to pleat; as, to plait
      a ruffle.

   2. To interweave the strands or locks of; to braid; to plat;
      as, to plait hair; to plait rope.

Plait \Plait\, n. [OE. playte, OF. pleit, L. plicatum, plicitum,
   p. p. of plicare to fold, akin to plectere to plait. See
   {Ply}, and cf. {Plat} to weave, {Pleat}, {Plight} fold.]
   1. A flat fold; a doubling, as of cloth; a pleat; as, a box
      plait.

            The plaits and foldings of the drapery. --Addison.

   2. A braid, as of hair or straw; a plat.

   {Polish plait}. (Med.) Same as {Plica}.

Source : WordNet®

plait
     n 1: a hairdo formed by braiding or twisting the hair [syn: {braid},
           {tress}, {twist}]
     2: any of various types of fold formed by doubling fabric back
        upon itself and then pressing or stitching into shape
        [syn: {pleat}]
     v 1: make by braiding or interlacing; "lace a tablecloth" [syn: {braid},
           {lace}]
     2: weave into plaits; "plait hair"