The Collaborative International Dictionary of English v.0.48:

Monition \Mo*ni"tion\, n. [F., fr. L. monitio, from monere to
   warn, bring to mind; akin to E. mind. See Mind, and cf.
   Admonish, Money, Monster.]
   1. Instruction or advice given by way of caution; an
      admonition; a warning; a caution.
      [1913 Webster]

            Sage monitions from his friends.      --Swift.
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   2. Information; indication; notice; advice.
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            We have no visible monition of . . . other periods,
            such as we have of the day by successive light and
            darkness.                             --Holder.
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   3. (Admiralty Practice) A process in the nature of a summons
      to appear and answer.
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   4. (Eccl. Law) An order monishing a party complained against
      to obey under pain of the law. --Shipley.
      [1913 Webster]

WordNet (r) 3.0 (2006):

monition
    n 1: a firm rebuke [syn: admonition, admonishment,
         monition]
    2: cautionary advice about something imminent (especially
       imminent danger or other unpleasantness); "a letter of
       admonition about the dangers of immorality"; "the warning was
       to beware of surprises"; "his final word of advice was not to
       play with matches" [syn: admonition, monition, warning,
       word of advice]
    3: a summons issued after the filing of a libel or claim
       directing all parties concerned to show cause why the
       judgment asked for should not be granted [syn: monition,
       process of monition]