The Collaborative International Dictionary of English v.0.48:

Evaporation \E*vap`o*ra"tion\, n. [L. evaporatio: cf. F.
   ['e]vaporation.]
   1. The process by which any substance is converted from a
      liquid state into, and carried off in, vapor; as, the
      evaporation of water, of ether, of camphor.
      [1913 Webster]

   2. The transformation of a portion of a fluid into vapor, in
      order to obtain the fixed matter contained in it in a
      state of greater consistence.
      [1913 Webster]

   3. That which is evaporated; vapor.
      [1913 Webster]

   4. (Steam Engine) See Vaporization.
      [1913 Webster]

WordNet (r) 3.0 (2006):

evaporation
    n 1: the process of becoming a vapor [syn: vaporization,
         vaporisation, vapor, vapour, evaporation]
    2: the process of extracting moisture [syn: dehydration,
       desiccation, drying up, evaporation]

Moby Thesaurus II by Grady Ward, 1.0:

122 Moby Thesaurus words for "evaporation":
   ablation, aeration, aerification, air-drying, anhydration,
   atomization, attenuation, blackout, blast-freezing, blocking,
   bottling, brining, broadcast, broadcasting, canning, circumfusion,
   consumption, corning, curing, decrease, decrement,
   dehumidification, dehydration, dematerialization, departure,
   depletion, depreciation, desiccation, diffraction, diffusion,
   dilution, disappearance, disappearing, dispensation, dispersal,
   dispersion, dissemination, dissipation, dissolution, dissolving,
   distillation, distribution, divergence, drain, drainage,
   dry-curing, drying, drying up, eclipse, elimination, embalming,
   erasure, erosion, etherealization, etherification, evanescence,
   exhalation, exhaustion, expansion, expenditure, extinction,
   fadeaway, fadeout, fading, fluidization, fractionation,
   fragmentation, freeze-drying, freezing, fumigation, fuming,
   gasification, going, impoverishment, insolation, irradiation,
   jerking, leakage, marination, melting, mummification, occultation,
   passing, peppering, pickling, potting, propagation, publication,
   quick-freezing, radiation, refrigeration, salting, scattering,
   scatterment, seasoning, shotgun pattern, shrinkage, smoking,
   sowing, spattering, splay, spread, spreading, sprinkling, steaming,
   strewing, stuffing, sublimation, taxidermy, tinning, using,
   using up, vanishing, vanishing point, vaporization, volatilization,
   wastage, waste, wearing, wearing away, wipe, withering