From The Collaborative International Dictionary of English v.0.48:

Flight \Flight\ (fl[imac]t), n. [AS. fliht, flyht, a flying, fr.
   fle['o]gan to fly; cf. flyht a fleeing, fr. fle['o]n to flee,
   G. flucht a fleeing, Sw. flykt, G. flug a flying, Sw. flygt,
   D. vlugt a fleeing or flying, Dan. flugt. [root]84. See
   Flee, Fly.]
   1. The act of flying; a passing through the air by the help
      of wings; volitation; mode or style of flying.
      [1913 Webster]

            Like the night owl's lazy flight.     --Shak.
      [1913 Webster]

   2. The act of fleeing; the act of running away, to escape
      danger or expected evil; hasty departure.
      [1913 Webster]

            Pray ye that your flight be not in the winter.
                                                  --Matt. xxiv.
                                                  20.
      [1913 Webster]

            Fain by flight to save themselves.    --Shak.
      [1913 Webster]

   3. Lofty elevation and excursion; a mounting; a soaring; as,
      a flight of imagination, ambition, folly.
      [1913 Webster]

            Could he have kept his spirit to that flight,
            He had been happy.                    --Byron.
      [1913 Webster]

            His highest flights were indeed far below those of
            Taylor.                               --Macaulay.
      [1913 Webster]

   4. A number of beings or things passing through the air
      together; especially, a flock of birds flying in company;
      the birds that fly or migrate together; the birds produced
      in one season; as, a flight of arrows. --Swift.
      [1913 Webster]

            Swift flights of angels ministrant.   --Milton.
      [1913 Webster]

            Like a flight of fowl
            Scattered winds and tempestuous gusts. --Shak.
      [1913 Webster]

   5. A series of steps or stairs from one landing to another.
      --Parker.
      [1913 Webster]

   6. A kind of arrow for the longbow; also, the sport of
      shooting with it. See Shaft. [Obs.]
      [1913 Webster]

            Challenged Cupid at the flight.       --Shak.
      [1913 Webster]

            Not a flight drawn home
            E'er made that haste that they have.  --Beau. & Fl.
      [1913 Webster]

   7. The husk or glume of oats. [Prov. Eng.] --Wright.
      [1913 Webster]

   8. a trip made by or in a flying vehicle, as an airplane,
      spacecraft, or aeronautical balloon.
      [PJC]

   9. A scheduled flight[8] on a commercial airline; as, the
      next flight leaves at 8 o'clock.
      [PJC]

   Flight feathers (Zool.), the wing feathers of a bird,
      including the quills, coverts, and bastard wing. See
      Bird.

   To put to flight, To turn to flight, to compel to run
      away; to force to flee; to rout.

   to take a flight[9], to make a trip in an airplane,
      especially a scheduled flight[9].
      [1913 Webster + PJC]

   Syn: Pair; set. See Pair.
        [1913 Webster]

From WordNet (r) 2.0:

flight
     n 1: a formation of aircraft in flight
     2: an instance of traveling by air; "flying was still an
        exciting adventure for him" [syn: flying]
     3: a stairway (set of steps) between one floor or landing and
        the next [syn: flight of stairs, flight of steps]
     4: the act of escaping physically; "he made his escape from the
        mental hospital"; "the canary escaped from its cage"; "his
        flight was an indication of his guilt" [syn: escape]
     5: an air force unit smaller than a squadron
     6: passing above and beyond ordinary bounds; "a flight of
        fancy"; "flights of rhetoric"; "flights of imagination"
     7: the path followed by an object moving through space [syn: trajectory]
     8: a flock of flying birds
     9: a scheduled trip by plane between designated airports; "I
        took the noon flight to Chicago"
     v 1: shoot a bird in flight
     2: fly in a flock; "flighting wild geese"
     3: decorate with feathers; "fledge an arrow" [syn: fledge]

From Moby Thesaurus II by Grady Ward, 1.0:

326 Moby Thesaurus words for "flight":
   AWOL, Brownian movement, French leave, a mass of, a world of,
   abandonment, abscond, absence without leave, absquatulation,
   acciaccatura, advance, aeronautics, aeroplane, air arm, air corps,
   air force, air service, air speed, aircraft, airlift, airline,
   airliner, alienation, altitude peak, angular motion, appoggiatura,
   arabesque, army, arrow, arrowhead, ascending, ascent, astronautics,
   autism, autistic thinking, automatic control, aviation,
   avoidance mechanism, axial motion, backflowing, backing,
   backward motion, ballooning, barb, beat a retreat, bevy,
   blame-shifting, blast-off, blind flying, bobtailed arrow, bolt,
   bolting, break, breakout, bunch, burn, burnout, cadence, cadenza,
   career, ceiling, celerity, charm, chested arrow, climbing,
   cloth yard shaft, cloud, cloud-seeding, clutter, coloratura,
   commercial aviation, compensation, contact flying, course, covey,
   cruising, current, dart, decamp, decampment, decompensation,
   defense mechanism, deliverance, delivery, depart, departure,
   dereism, dereistic thinking, descending, descent, desert,
   desertion, disappearance, disappearing act, dismiss, dispatch,
   disperse, displacement, dissociation, division, downward motion,
   drift, driftage, ebbing, egress, elopement, embellishment,
   emergence, emigration, emotional insulation, end of burning,
   escadrille, escape, escape into fantasy, escape mechanism,
   escapism, evacuation, evasion, excursion, exit, exodus,
   expatriation, expedition, extrication, fantasizing, fantasy,
   fastness, feather, fioritura, flee, fleeing, flit, flock, flocks,
   flourish, flow, flurry, flux, flying, forward motion, freeing,
   fugitation, gaggle, general aviation, getaway, gliding, going,
   grace, grace note, ground speed, hail, haste, hasty retreat,
   hegira, hive, hop, host, hurry, ignition, immigration, impact,
   in-migration, incidental, incidental note, instantaneousness,
   intermigration, isolation, issuance, issue, jailbreak, jam, jump,
   knots, lam, large amount, launch, leak, leakage, leaving, legion,
   liberation, lift-off, light out, lightning speed, long mordent,
   lots, many, masses of, migration, miles per hour, mob, mordent,
   mounting, muchness, multitude, murmuration, negativism, nest,
   numbers, oblique motion, ongoing, onrush, ornament, out-migration,
   outlet, overcompensation, pack, parting, passage, passing,
   pilotage, plague, plane, plunging, plurality, pralltriller,
   precipitation, prisonbreak, progress, projection, promptitude,
   promptness, psychotaxis, put to flight, quantities, quarrel,
   quick exit, quickness, quite a few, radial motion, random motion,
   rapidity, rationalization, reed, reflowing, refluence, reflux,
   regression, release, remigration, removal, rescue, resistance,
   retirement, retreat, retrogression, riddance, rising,
   rocket launching, roulade, round pace, rout, rpm, ruck, run,
   running away, rush, sailing, sailplaning, scape, scores, scramming,
   send away, send off, send packing, set, setting-free, shaft, shoal,
   shoot, shot, shove off, sideward motion, single mordent, sinking,
   skedaddle, skedaddling, skein, slip, snappiness, soaring,
   sociological adjustive reactions, solo, speed, speediness, split,
   spring, squadron, stampede, sternway, strategic air force, stream,
   sublimation, subsiding, substitution, swarm, swarming, swift rate,
   swiftness, tactical air force, take flight, test flight, throng,
   tidy sum, traject, trajectory, trajet, transmigration, trek, trend,
   trip, turn, upward motion, velocity, velocity peak, vent, volley,
   walkout, watch, wing, winging, wish-fulfillment fantasy,
   wishful thinking, withdraw, withdrawal, worlds of

From Bouvier's Law Dictionary, Revised 6th Ed (1856):

FLIGHT, crim. law. The evading the course of justice, by a man's voluntarily 
withdrawing himself. 4 Bl. Com. 387. Vide Fugitive from justice.