The Collaborative International Dictionary of English v.0.48:

Poetic \Po*et"ic\, Poetical \Po*et"ic*al\, a. [L. po["e]ticus,
   Gr. ?: cf. F. po['e]tiquee.]
   1. Of or pertaining to poetry; suitable for poetry, or for
      writing poetry; as, poetic talent, theme, work,
      sentiments. --Shak.
      [1913 Webster]

   2. Expressed in metrical form; exhibiting the imaginative or
      the rhythmical quality of poetry; as, a poetical
      composition; poetical prose.
      [1913 Webster]

   Poetic license. See License, n., 4.
      [1913 Webster]

WordNet (r) 3.0 (2006):

poetic
    adj 1: of or relating to poetry; "poetic works"; "a poetic
           romance" [syn: poetic, poetical]
    2: characterized by romantic imagery; "Turner's vision of the
       rainbow...was poetic"
    3: of or relating to poets; "poetic insight"
    4: characteristic of or befitting poetry; "poetic diction" [syn:
       poetic, poetical]

Moby Thesaurus II by Grady Ward, 1.0:

58 Moby Thesaurus words for "poetic":
   Alcaic, Anacreontic, Castalian, Homeric, Hudibrastic, Parnassian,
   Pierian, Pindaric, Theocritean, aesthetic, airy, artistic,
   autistic, bardic, bucolic, dereistic, didactic, dithyrambic,
   dramatic, eclogic, elegiac, epic, georgic, heroic, idealistic,
   idyllic, impractical, in the clouds, lyrical, melodic, melodious,
   metrical, mock-heroic, musical, narrative, otherworldly, pastoral,
   poetical, poetico-mystical, poetico-mythological,
   poetico-philosophic, poetlike, quixotic, rhapsodic, romancing,
   romantic, romanticized, runic, sapphic, skaldic, starry-eyed,
   storybook, transcendental, transmundane, unpractical, unrealistic,
   visionary, wish-fulfilling