The Collaborative International Dictionary of English v.0.48:

Determine \De*ter"mine\, v. t. [imp. & p. p. Determined; p.
   pr. & vb. n. Determining.] [F. d['e]terminer, L.
   determinare, determinatum; de + terminare limit, terminus
   limit. See Term.]
   1. To fix the boundaries of; to mark off and separate.
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            [God] hath determined the times before appointed.
                                                  --Acts xvii.
                                                  26.
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   2. To set bounds to; to fix the determination of; to limit;
      to bound; to bring to an end; to finish.
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            The knowledge of men hitherto hath been determined
            by the view or sight.                 --Bacon.
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            Now, where is he that will not stay so long
            Till his friend sickness hath determined me? --Shak.
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   3. To fix the form or character of; to shape; to prescribe
      imperatively; to regulate; to settle.
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            The character of the soul is determined by the
            character of its God.                 --J. Edwards.
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            Something divinely beautiful . . . that at some time
            or other might influence or even determine her
            course of life.                       --W. Black.
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   4. To fix the course of; to impel and direct; -- with a
      remoter object preceded by to; as, another's will
      determined me to this course.
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   5. To ascertain definitely; to find out the specific
      character or name of; to assign to its true place in a
      system; as, to determine an unknown or a newly discovered
      plant or its name.
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   6. To bring to a conclusion, as a question or controversy; to
      settle authoritative or judicial sentence; to decide; as,
      the court has determined the cause.
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   7. To resolve on; to have a fixed intention of; also, to
      cause to come to a conclusion or decision; to lead; as,
      this determined him to go immediately.
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   8. (Logic) To define or limit by adding a differentia.
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   9. (Physical Sciences) To ascertain the presence, quantity,
      or amount of; as, to determine the parallax; to determine
      the salt in sea water.
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The Collaborative International Dictionary of English v.0.48:

Determined \De*ter"mined\, a.
   Decided; resolute. "Adetermined foe." --Sparks.
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WordNet (r) 3.0 (2006):

determined
    adj 1: characterized by great determination; "a struggle against
           a determined enemy"
    2: having been learned or found or determined especially by
       investigation [ant: undetermined]
    3: devoting full strength and concentrated attention to; "made
       continued and determined efforts to find and destroy enemy
       headquarters"
    4: determined or decided upon as by an authority; "date and
       place are already determined"; "the dictated terms of
       surrender"; "the time set for the launching" [syn:
       determined, dictated, set]
    5: strongly motivated to succeed [syn: compulsive,
       determined, driven]

Moby Thesaurus II by Grady Ward, 1.0:

162 Moby Thesaurus words for "determined":
   actual, adamant, approaching, arrogant, ascertained, assured,
   attested, authenticated, bent, borne out, bound,
   bound and determined, categorically true, certain, certified,
   circumscribed, circumscript, circumstantiated, cocksure, coming,
   committed, confident, confirmed, constant, convinced, corroborated,
   decided, decisive, dedicated, defined, definite, delimited,
   demarcated, demonstrated, desired, destinal, destined, determinate,
   devoted, distinct, documentary, dogged, earnest, effectual,
   emergent, encircled, established, eventual, exact, experimental,
   extrapolated, factual, fatal, fated, fatidic, firm, fixed,
   forthcoming, future, futuristic, guaranteed, hedged about,
   hereafter, historical, hoped-for, hubristic, identified, imminent,
   in the bag, intent, later, made sure, nailed down, nearing,
   not in error, objectively true, obstinate, on ice, open-and-shut,
   overconfident, oversure, overweening, persevering, persistent,
   persuaded, planned, plotted, poised, pompous, positive, precise,
   predetermined, predicted, probable, projected, prophesied,
   prospective, proud, proved, proven, purposeful, real, reassured,
   relentless, resolute, resolved, secure, self-assured,
   self-confident, self-important, self-reliant, serious, set,
   settled, shown, sincere, single-minded, specific, stated, steady,
   strong-minded, strong-willed, stubborn, substantiated, sure,
   sure-enough, surrounded, tenacious, tentative, tested, to come,
   to-be, trial, tried, true, true as gospel, truthful, ultimate,
   unafraid, unconfuted, undenied, undoubted, undoubting, unerroneous,
   unfallacious, unfalse, unfaltering, unflinching, unhesitating,
   unmistaken, unquestionable, unrefuted, unwavering, unyielding,
   validated, venturesome, veracious, verified, veritable, warranted,
   wholehearted, willing