[1] : The Collaborative International Dictionary of English v.0.48

warn \warn\, v. t. imp.  p. p. warned; p. pr.  vb. n.
   warning. oe. warnen, warnien, as. warnian, wearnian, to
   take heed, to warn; akin to as. wearn denial, refusal, os.
   warning, wernian, to refuse, ohg. warnen, g. warnen to warn,
   ofries. warna, werna, icel. varna to refuse; and probably to
   e. wary. ????.
   1913 webster
   1. to make ware or aware; to give previous information to; to
      give notice to; to notify; to admonish; hence, to notify
      or summon by authority; as, to warn a town meeting; to
      warn a tenant to quit a house. "warned of the ensuing
      fight." --dryden.
      1913 webster

            cornelius the centurion . . . was warned from god by
            an holy angel to send for thee.       --acts x. 22.
      1913 webster

            who is it that hath warned us to the walls? --shak.
      1913 webster

   2. to give notice to, of approaching or probable danger or
      evil; to caution against anything that may prove
      injurious. "juturna warns the daunian chief of lausus'
      danger, urging swift relief." --dryden.
      1913 webster

   3. to ward off. obs. --spenser.
      1913 webster
see also:
warned warning 

[2] : The Collaborative International Dictionary of English v.0.48

warning \warn"ing\, a.
   giving previous notice; cautioning; admonishing; as, a
   warning voice.
   1913 webster

         that warning timepiece never ceased.     --longfellow.
   1913 webster

   warning piece, warning wheel horol., a piece or wheel
      which produces a sound shortly before the clock strikes.
      1913 webster
see also:
warning piece warning wheel 

[3] : The Collaborative International Dictionary of English v.0.48

warning \warn"ing\, n.
   1. previous notice. "at a month's warning." --dryden.
      1913 webster

            a great journey to take upon so short a warning.
                                                  --l'estrange.
      1913 webster

   2. caution against danger, or against faults or evil
      practices which incur danger; admonition; monition.
      1913 webster

            could warning make the world more just or wise.
                                                  --dryden.
      1913 webster

[4] : WordNet (r) 2.0

warning
     adj : serving to warn; "shook a monitory finger at him"; "an
           exemplary jail sentence" syn: admonitory, cautionary,
            exemplary, monitory, warninga
     n 1: a message informing of danger
     2: cautionary advice about something imminent especially
        imminent danger syn: admonition, monition, word of
        advice
see also:
admonitory cautionary exemplary monitory warninga admonition 
monition word of advice 

[5] : Moby Thesaurus II by Grady Ward, 1.0

135 moby thesaurus words for "warning":
   admonishing, admonition, admonitory, advice, advising, advisory,
   advocacy, alerting, augural, blackmail, briefing, bulldozing, call,
   call for, caution, cautionary, cautioning, caveat, claim, clue,
   commination, consultation, consultative, consultatory,
   contribution, council, counsel, cue, demand, demand for,
   denunciation, determent, deterrence, deterrent, didactic,
   direction, directive, draft, drain, duty, empty threat, exaction,
   exemplary, exhortation, exhortative, exhortatory, expostulation,
   expostulative, expostulatory, extortion, extortionate demand,
   foreboding, forerunning, foreshadowing, foreshowing, foretokening,
   forewarning, frightening off, guidance, heavy demand,
   heavy with meaning, hint, hortation, hortative, hortatory, idea,
   idle threat, imminence, implied threat, imposition, impost, indent,
   indicative, insistent demand, instruction, instructive,
   intimidation, intuitive, levy, meaningful, menace, monition,
   monitorial, monitory, moralistic, nonnegotiable demand, notice,
   notificational, notifying, office, opinion, order, parley,
   passing word, pointer, preachy, precursive, precursory, predictive,
   prefigurative, preindicative, premonitory, presageful, presaging,
   prognostic, prognosticative, promise of harm, proposal,
   recommendation, recommendatory, remonstrance, remonstrant,
   remonstrative, remonstratory, requirement, requisition, rush,
   rush order, sententious, significant, steer, suggestion,
   sword of damocles, talking out of, tax, taxing, thought, threat,
   threateningness, threatfulness, tip, tip-off, tribute, ultimatum,
   whisper

Warning >> W Words
Warning, definition of term: Warning
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Warning Device >> W Words
Warning Device, definition of term: Warning Device
warning+device_pag1.html

Early Warning S >> E Words
Early Warning S, definition of term: Early Warning S
early+warning+s_pag1.html