The Collaborative International Dictionary of English v.0.48:

Presentiment \Pre*sen"ti*ment\, n. [Pref. pre- + sentiment: cf.
   F. pressentiment. See Presentient.]
   Previous sentiment, conception, or opinion; previous
   apprehension; especially, an antecedent impression or
   conviction of something unpleasant, distressing, or
   calamitous, about to happen; anticipation of evil;
   foreboding.
   [1913 Webster]

WordNet (r) 3.0 (2006):

presentiment
    n 1: a feeling of evil to come; "a steadily escalating sense of
         foreboding"; "the lawyer had a presentiment that the judge
         would dismiss the case" [syn: foreboding, premonition,
         presentiment, boding]

Moby Thesaurus II by Grady Ward, 1.0:

83 Moby Thesaurus words for "presentiment":
   actuarial prediction, advance notice, affect, affection,
   apocalypse, apprehensiveness, clairvoyance, discomposing,
   discomposure, disquietude, disturbance, emotion, emotional charge,
   emotional shade, experience, feeling, feeling tone, foreboding,
   forecast, forecasting, forefeeling, foreknowing, foreknowledge,
   foreseeability, foreshowing, foresight, foretelling, forewarning,
   forewisdom, funny feeling, guesswork, gut reaction, heartthrob,
   hunch, impression, improbability, intimation, intuition,
   intuitive impression, misgiving, omen, passion, perturbation,
   plenty of notice, portent, preapprehension, precautioning,
   precognition, prediction, prefiguration, prefigurement,
   prefiguring, premonition, prenotice, prenotification, prenotion,
   presage, presaging, prescience, preshowing, presignifying,
   prewarning, probability, profound sense, prognosis,
   prognostication, promise, prophecy, prophesying, prospectus,
   reaction, response, sensation, sense, sentiment, soothsay,
   speculation, statistical prediction, suspicion, undercurrent,
   vague feeling, vague idea, vaticination