The Collaborative International Dictionary of English v.0.48:

Settle \Set"tle\, v. t. [imp. & p. p. Settled; p. pr. & vb. n.
   Settling.] [OE. setlen, AS. setlan. [root]154. See
   Settle, n. In senses 7, 8, and 9 perhaps confused with OE.
   sahtlen to reconcile, AS. sahtlian, fr. saht reconciliation,
   sacon to contend, dispute. Cf. Sake.]
   1. To place in a fixed or permanent condition; to make firm,
      steady, or stable; to establish; to fix; esp., to
      establish in life; to fix in business, in a home, or the
      like.
      [1913 Webster]

            And he settled his countenance steadfastly upon him,
            until he was ashamed.                 --2 Kings
                                                  viii. 11.
                                                  (Rev. Ver.)
      [1913 Webster]

            The father thought the time drew on
            Of setting in the world his only son. --Dryden.
      [1913 Webster]

   2. To establish in the pastoral office; to ordain or install
      as pastor or rector of a church, society, or parish; as,
      to settle a minister. [U. S.]
      [1913 Webster]

   3. To cause to be no longer in a disturbed condition; to
      render quiet; to still; to calm; to compose.
      [1913 Webster]

            God settled then the huge whale-bearing lake.
                                                  --Chapman.
      [1913 Webster]

            Hoping that sleep might settle his brains. --Bunyan.
      [1913 Webster]

   4. To clear of dregs and impurities by causing them to sink;
      to render pure or clear; -- said of a liquid; as, to
      settle coffee, or the grounds of coffee.
      [1913 Webster]

   5. To restore or bring to a smooth, dry, or passable
      condition; -- said of the ground, of roads, and the like;
      as, clear weather settles the roads.
      [1913 Webster]

   6. To cause to sink; to lower; to depress; hence, also, to
      render close or compact; as, to settle the contents of a
      barrel or bag by shaking it.
      [1913 Webster]

   7. To determine, as something which is exposed to doubt or
      question; to free from unscertainty or wavering; to make
      sure, firm, or constant; to establish; to compose; to
      quiet; as, to settle the mind when agitated; to settle
      questions of law; to settle the succession to a throne; to
      settle an allowance.
      [1913 Webster]

            It will settle the wavering, and confirm the
            doubtful.                             --Swift.
      [1913 Webster]

   8. To adjust, as something in discussion; to make up; to
      compose; to pacify; as, to settle a quarrel.
      [1913 Webster]

   9. To adjust, as accounts; to liquidate; to balance; as, to
      settle an account.
      [1913 Webster]

   10. Hence, to pay; as, to settle a bill. [Colloq.] --Abbott.
       [1913 Webster]

   11. To plant with inhabitants; to colonize; to people; as,
       the French first settled Canada; the Puritans settled New
       England; Plymouth was settled in 1620.
       [1913 Webster]

   To settle on or To settle upon,
       (a) to confer upon by permanent grant; to assure to. "I .
           . . have settled upon him a good annuity." --Addison.
       (b) to choose; to decide on; -- sometimes with the
           implication that the choice is not ideal, but the
           best available.

   To settle the land (Naut.), to cause it to sink, or appear
      lower, by receding from it.
      [1913 Webster]

   Syn: To fix; establish; regulate; arrange; compose; adjust;
        determine; decide.
        [1913 Webster]

WordNet (r) 3.0 (2006):

settled
    adj 1: established or decided beyond dispute or doubt; "with
           details of the wedding settled she could now sleep at
           night" [ant: unsettled]
    2: established in a desired position or place; not moving about;
       "nomads...absorbed among the settled people"; "settled
       areas"; "I don't feel entirely settled here"; "the advent of
       settled civilization" [ant: unsettled]
    3: inhabited by colonists [syn: colonized, colonised,
       settled]
    4: not changeable; "a period of settled weather"

Moby Thesaurus II by Grady Ward, 1.0:

232 Moby Thesaurus words for "settled":
   SOL, acquitted, agreed, all bets off, all off, all over, all up,
   all up with, anchored, arranged, ascertained, assigned, assured,
   at an end, attested, authenticated, beat, beaten, bent, bested,
   borne out, canceled, certain, certified, chronic, circumstantiated,
   colonized, compacted, complete, concluded, confirmed, confounded,
   constant, contracted, corroborated, covenanted, dead, decided,
   decisive, deep-dyed, deep-engraven, deep-fixed, deep-grounded,
   deep-laid, deep-rooted, deep-seated, deep-set, deep-settled,
   defeated, defunct, deleted, demonstrated, deployed, determinate,
   determined, discharged, discomfited, done, done for, done in,
   done with, down, dyed-in-the-wool, embedded, embosomed, embossed,
   empeopled, emplaced, ended, engaged, engrafted, engraved,
   ensconced, entrenched, established, etched, expended, expunged,
   extinct, fallen, fast, fastened, fini, finished, firm,
   firmly established, fixed, flinty, floored, graven, guaranteed,
   hired, hors de combat, immovable, implanted, impressed, imprinted,
   in the bag, incorrigible, inculcated, indelibly impressed, infixed,
   inflexible, ingrained, ingrown, inhabited, installed, instilled,
   intent, inveterate, inwrought, irreversible, kaput, lambasted,
   lathered, licked, liquidated, located, long-established, loyal,
   made sure, nailed down, occupied, old-line, on a rock, on bedrock,
   on ice, on the skids, open-and-shut, outdone, over, overborne,
   overcome, overmastered, overmatched, overpowered, overridden,
   overthrown, overturned, overwhelmed, paid, paid in full, panicked,
   peopled, perfected, placed, planted, populated, populous,
   positioned, posted, postpaid, prepaid, promised, proved, proven,
   put to rout, receipted, remitted, resolute, resolved, riveted,
   rooted, routed, ruined, salaried, scattered, sealed, seated,
   secure, set, set at rest, settled in habit, shot, shown, signed,
   silenced, situate, situated, skinned, skinned alive, sot, spent,
   spotted, stabilized, stampeded, staple, stated, stationed, staunch,
   steadfast, steady, steely, stipulated, substantiated, sworn,
   tenanted, terminated, tested, thorough, through, through with,
   tried, trimmed, trounced, true, unbending, undeflectable,
   undertaken, undone, unflappable, unshaken, unswerving, unyielding,
   upset, validated, verified, vested, waged, warranted, washed up,
   well-established, well-founded, well-grounded, well-set,
   well-settled, whelmed, whipped, wiped out, worsted, wound up,
   zapped