The Collaborative International Dictionary of English v.0.48:

Indicate \In"di*cate\, v. t. [imp. & p. p. Indicated; p. pr. &
   vb. n. Indicating.] [L. indicatus, p. p. of indicare to
   indicate; pref. in- in + dicare to proclaim; akin to dicere
   to say. See Diction, and cf. Indict, Indite.]
   [1913 Webster]
   1. To point out; to discover; to direct to a knowledge of; to
      show; to make known.
      [1913 Webster]

            That turns and turns to indicate
            From what point blows the weather.    --Cowper.
      [1913 Webster]

   2. (Med.) To show or manifest by symptoms; to point to as the
      proper remedies; as, great prostration of strength
      indicates the use of stimulants. Opposite of
      contraindicate.
      [1913 Webster +PJC]

   3. (Mach.) To investigate the condition or power of, as of
      steam engine, by means of an indicator.

   Syn: To show; mark; signify; denote; discover; evidence;
        evince; manifest; declare; specify; explain; exhibit;
        present; reveal; disclose; display.
        [1913 Webster]

WordNet (r) 3.0 (2006):

indicate
    v 1: be a signal for or a symptom of; "These symptoms indicate a
         serious illness"; "Her behavior points to a severe
         neurosis"; "The economic indicators signal that the euro is
         undervalued" [syn: bespeak, betoken, indicate,
         point, signal]
    2: indicate a place, direction, person, or thing; either
       spatially or figuratively; "I showed the customer the glove
       section"; "He pointed to the empty parking space"; "he
       indicated his opponents" [syn: indicate, point,
       designate, show]
    3: to state or express briefly; "indicated his wishes in a
       letter" [ant: contraindicate]
    4: give evidence of; "The evidence argues for your claim"; "The
       results indicate the need for more work" [syn: argue,
       indicate]
    5: suggest the necessity of an intervention; in medicine;
       "Tetracycline is indicated in such cases" [syn: indicate,
       suggest] [ant: contraindicate]

Moby Thesaurus II by Grady Ward, 1.0:

138 Moby Thesaurus words for "indicate":
   adumbrate, affect, allude to, approve, argue, assign, attest,
   augur, be construed as, be indicative of, be significant of,
   be symptomatic of, bespeak, betoken, brandish, breathe,
   bring forth, bring forward, bring into view, bring out,
   bring to notice, call attention to, call for, characterize,
   connote, dangle, demand, demonstrate, denominate, denote,
   designate, determine, develop, differentiate, direct attention to,
   disclose, display, divine, divulge, dramatize, drop a hint, embody,
   enact, entail, evidence, evince, exhibit, expose to view, express,
   fix, flaunt, flourish, foretoken, furnish evidence, give a hint,
   give evidence, give indication of, give sign, give the cue,
   give token, glance at, go to show, highlight, hint, hint at,
   identify, illuminate, illustrate, imply, import, incarnate,
   indicate, insinuate, intimate, involve, make clear, make known,
   make plain, manifest, mark, materialize, mean, mention, name, need,
   note, parade, perform, pick out, pin down, point out, point to,
   prefigure, preindicate, present, presign, presignal, presignify,
   pretypify, produce, prompt, recommend, refer to, register,
   represent, require, reveal, roll out, say, select, set, set forth,
   show, show forth, show signs of, signalize, signify,
   speak for itself, speak volumes, specialize, specify, spell,
   spotlight, stand for, state, stipulate, suggest, symbolize,
   symptomatize, symptomize, tell, tend to show, testify, token,
   trot out, typify, unfold, wave