The Collaborative International Dictionary of English v.0.48:

Protract \Pro*tract"\, v. t. [imp. & p. p. Protracted; p. pr.
   vb. n. Protracting.] [L. protractus, p. p. of protrahere to
   forth, protract; pro forward + trahere to draw. See
   Portrait, Portray.]
   1. To draw out or lengthen in time or (rarely) in space; to
      continue; to prolong; as, to protract an argument; to
      protract a war.
      [1913 Webster]

   2. To put off to a distant time; to delay; to defer; as, to
      protract a decision or duty. --Shak.
      [1913 Webster]

   3. (Surv.) To draw to a scale; to lay down the lines and
      angles of, with scale and protractor; to plot.
      [1913 Webster]

   4. (Zool.) To extend; to protrude; as, the cat can protract
      its claws; -- opposed to retract.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Protract \Pro*tract"\, n. [L. protractus.]
   Tedious continuance or delay. [Obs.] --Spenser.
   [1913 Webster]

WordNet (r) 3.0 (2006):

protract
    v 1: lengthen in time; cause to be or last longer; "We prolonged
         our stay"; "She extended her visit by another day"; "The
         meeting was drawn out until midnight" [syn: prolong,
         protract, extend, draw out]