The Collaborative International Dictionary of English v.0.48:

Straddle \Strad"dle\, v. i. [imp. & p. p. Straddled; p. pr. &
   vb. n. Straddling.] [Freq. from the root of stride.]
   1. To part the legs wide; to stand or to walk with the legs
      far apart.
      [1913 Webster]

   2. To stand with the ends staggered; -- said of the spokes of
      a wagon wheel where they join the hub.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Straddle \Strad"dle\, v. t.
   To place one leg on one side and the other on the other side
   of; to stand or sit astride of; as, to straddle a fence or a
   horse.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Straddle \Strad"dle\, n.
   1. The act of standing, sitting, or walking, with the feet
      far apart.
      [1913 Webster]

   2. The position, or the distance between the feet, of one who
      straddles; as, a wide straddle.
      [1913 Webster]

   3. A stock option giving the holder the double privilege of a
      "put" and a "call," i. e., securing to the buyer of the
      option the right either to demand of the seller at a
      certain price, within a certain time, certain securities,
      or to require him to take at the same price, and within
      the same time, the same securities. [Broker's Cant]
      [1913 Webster]

WordNet (r) 3.0 (2006):

straddle
    n 1: a noncommittal or equivocal position
    2: a gymnastic exercise performed with a leg on either side of
       the parallel bars
    3: the act of sitting or standing astride [syn: straddle,
       span]
    4: the option to buy or sell a given stock (or stock index or
       commodity future) at a given price before a given date;
       consists of an equal number of put and call options
    v 1: sit or stand astride of
    2: range or extend over; occupy a certain area; "The plants
       straddle the entire state" [syn: range, straddle]
    3: be noncommittal

Moby Thesaurus II by Grady Ward, 1.0:

139 Moby Thesaurus words for "straddle":
   abstain, abut on, across, amble, astraddle, astride, barge,
   be based on, bear on, bestraddle, bestride, bowl along, bundle,
   bypass, call, carry, clump, cop out, cover, cross, drag,
   duck the issue, encompass, environ, evade, evade the issue, extend,
   flounce, foot, footslog, ford, get ahead of, go, go across, go by,
   go out, halt, hippety-hop, hitch, hobble, hold, hop, horseback,
   jog, jolt, jump, lean on, lie, lie on, limp, lumber, lunge, lurch,
   mince, on, on horseback, option, overstride, pace, paddle, pass,
   pass by, pass over, peg, perch, piaffe, piaffer, plod, prance, put,
   put and call, rack, ramble, range, reach, reach out, rely on,
   repose on, rest on, ride, right, roll, run, sashay, saunter,
   scramble, scuff, scuffle, shoot ahead of, shuffle, sidle,
   single-foot, sit it out, sit on, skip, slink, slither, slog,
   slouch, span, sprangle, spread, spread-eagle, stagger, stalk,
   stamp, stand neuter, stand on, step over, stock option, stomp,
   straddle-legged, straddleback, straggle, strap, stretch,
   stretch out, stride, strip, stroll, strut, stump, surround,
   swagger, sweep, swing, take in, thrust out, tittup, toddle, totter,
   traipse, trim, trip, trudge, waddle, wamble, wiggle, wobble