Source : Webster's Revised Unabridged Dictionary (1913)

Three \Three\, n.
   1. The number greater by a unit than two; three units or
      objects.

   2. A symbol representing three units, as 3 or iii.

   {Rule of three}. (Arith.) See under {Rule}, n.

Three \Three\, a. [OE. [thorn]re, [thorn]reo, [thorn]ri, AS.
   [thorn]r[=i], masc., [thorn]re['o], fem. and neut.; akin to
   OFries. thre, OS. thria, threa, D. drie, G. drei, OHG.
   dr[=i], Icel. [thorn]r[=i]r, Dan. & Sw. tre, Goth.
   [thorn]reis, Lith. trys, Ir., Gael. & W. tri, Russ. tri, L.
   tres, Gr. trei^s, Skr. tri. [root]301. Cf. 3d {Drilling},
   {Tern}, a., {Third}, {Thirteen}, {Thirty}, {Tierce}, {Trey},
   {Tri-}, {Triad}, {Trinity}, {Tripod}.]
   One more than two; two and one. ``I offer thee three
   things.'' --2 Sam. xxiv. 12.

         Three solemn aisles approach the shrine. --Keble.

   Note: Three is often joined with other words, forming
         compounds signifying divided into, composed of, or
         containing, three parts, portions, organs, or the like;
         as, three-branched, three-capsuled, three-celled,
         three-cleft, three-edged, three-foot, three-footed,
         three-forked, three-grained, three-headed,
         three-legged, three-mouthed, three-nooked,
         three-petaled, three-pronged, three-ribbed,
         three-seeded, three-stringed, three-toed, and the like.

Source : WordNet®

three
     adj : being one more than two [syn: {3}, {iii}]

three
     n : the cardinal number that is the sum of one and one and one
         [syn: {3}, {III}, {trio}, {threesome}, {tierce}, {leash},
          {troika}, {triad}, {trine}, {trinity}, {ternary}, {ternion},
          {triplet}, {tercet}, {terzetto}, {trey}, {deuce-ace}]