The Collaborative International Dictionary of English v.0.48:

Afflatus \Af*fla"tus\, n. [L., fr. afflare. See Afflation.]
   1. A breath or blast of wind.
      [1913 Webster]

   2. A divine impartation of knowledge; supernatural impulse;
      inspiration.
      [1913 Webster]

            A poet writing against his genius will be like a
            prophet without his afflatus.         --Spence.
      [1913 Webster]

WordNet (r) 3.0 (2006):

afflatus
    n 1: a strong creative impulse; divine inspiration; "divine
         afflatus"

Moby Thesaurus II by Grady Ward, 1.0:

54 Moby Thesaurus words for "afflatus":
   Apollo, Apollo Musagetes, Bragi, Calliope, Castilian Spring, Erato,
   Euterpe, Geist, Helicon, Hippocrene, Muse, Parnassus,
   Pierian Spring, Pierides, Polyhymnia, animating spirit, animation,
   animus, apocalypse, creative imagination, creative thought,
   creativity, daemon, daimonion, demon, direct communication,
   divine afflatus, divine inspiration, divine revelation,
   enlivenment, epiphany, exhilaration, fire, fire of genius, firing,
   genius, infection, infusion, inspiration, moving spirit,
   mystical experience, mysticism, poesy, poetic genius, prophecy,
   revelation, soul, spirit, talent, the Muses, theophania, theophany,
   theopneustia, theopneusty