The Collaborative International Dictionary of English v.0.48:

Monitory \Mon"i*to*ry\, n.
   Admonition; warning; especially, a monition proceeding from
   an ecclesiastical court, but not addressed to any one person.
   [1913 Webster] Monitress

The Collaborative International Dictionary of English v.0.48:

Monitory \Mon"i*to*ry\, a. [L. monitorius.]
   Giving admonition; instructing by way of caution; warning.
   [1913 Webster]

         Losses, miscarriages, and disappointments, are monitory
         and instructive.                         --L'Estrange.
   [1913 Webster]

WordNet (r) 3.0 (2006):

monitory
    adj 1: serving to warn; "shook a monitory finger at him"; "an
           exemplary jail sentence" [syn: admonitory,
           cautionary, exemplary, monitory, warning(a)]

Moby Thesaurus II by Grady Ward, 1.0:

65 Moby Thesaurus words for "monitory":
   admonishing, admonitory, advisory, augural, cautionary, cautioning,
   communicative, consultative, consultatory, counseling, critical,
   deterrent, didactic, directive, discouraging, disinclining,
   dissuading, dissuasive, educational, educative, enlightening,
   exemplary, exhortative, exhortatory, expostulative, expostulatory,
   forerunning, foreshadowing, foreshowing, foretokening, forewarning,
   heavy with meaning, hortative, hortatory, indicative,
   informational, informative, informing, instructive, intimidating,
   intuitive, meaningful, monitorial, moralistic, moralizing,
   notificational, notifying, preachy, precursive, precursory,
   predictive, prefigurative, preindicative, premonitory, presageful,
   presaging, prognostic, prognosticative, recommendatory,
   remonstrant, remonstrative, remonstratory, sententious,
   significant, warning