The Collaborative International Dictionary of English v.0.48:

Felicity \Fe*lic"i*ty\, n.; pl. Felicities. [OE. felicite, F.
   f['e]licit['e], fr. L. felicitas, fr. felix, -icis, happy,
   fruitful; akin to fetus.]
   1. The state of being happy; blessedness; blissfulness;
      enjoyment of good.
      [1913 Webster]

            Our own felicity we make or find.     --Johnson.
      [1913 Webster]

            Finally, after this life, to attain everlasting joy
            and felicity.                         --Book of
                                                  Common Prayer.
      [1913 Webster]

   2. That which promotes happiness; a successful or gratifying
      event; prosperity; blessing.
      [1913 Webster]

            the felicities of her wonderful reign. --Atterbury.
      [1913 Webster]

   3. A pleasing faculty or accomplishment; as, felicity in
      painting portraits, or in writing or talking. "Felicity of
      expression." --Bp. Warburton.

   Syn: Happiness; bliss; beatitude; blessedness; blissfulness.
        See Happiness.
        [1913 Webster]

WordNet (r) 3.0 (2006):

felicity
    n 1: pleasing and appropriate manner or style (especially manner
         or style of expression) [syn: felicity, felicitousness]
         [ant: infelicity]
    2: state of well-being characterized by emotions ranging from
       contentment to intense joy [syn: happiness, felicity]
       [ant: unhappiness]

Moby Thesaurus II by Grady Ward, 1.0:

174 Moby Thesaurus words for "felicity":
   Atticism, Easy Street, admissibility, affluence, an ear for,
   an eye for, applicability, appositeness, appropriateness, aptitude,
   aptness, articulateness, beatification, beatitude, becomingness,
   bed of roses, bent, bewitchment, blessedness, blessing, bliss,
   blissfulness, capacity for, chasteness, chastity, cheer,
   cheerfulness, civility, clarity, classicalism, classicism,
   clearness, cloud nine, clover, comeliness, comfort,
   command of language, command of words, correctness, decency,
   decorousness, decorum, delectation, delight, dignity, directness,
   discrimination, distinction, ease, easy circumstances, ecstasy,
   ecstatics, effective style, elation, elegance, elegancy, eloquence,
   eloquent tongue, enchantment, exaltation, exhilaration, expression,
   expressiveness, exuberance, facundity, felicitousness, finish,
   fitness, fittedness, fittingness, flair, fleshpots, flow,
   flowing periods, fluency, fortunateness, fortune, gaiety,
   genius for, genteelness, gentility, gift for, gift of expression,
   gift of gab, gladness, glee, glibness, good fortune, good luck,
   good taste, grace, gracefulness, gracility, gracious life,
   gracious living, graphicness, happiness, happy fortune, heaven,
   high spirits, inclination, innate aptitude, intoxication, joy,
   joyance, joyfulness, lap of luxury, leaning, life of ease,
   limpidity, loaves and fishes, lucidity, luck, luckiness, luxury,
   meaningfulness, meetness, naturalness, neatness, oratory,
   overhappiness, overjoyfulness, paradise, pellucidity, perspicuity,
   plainness, polish, propensity, properness, propriety, prosperity,
   prosperousness, purity, qualification, rapture, ravishment,
   refinement, relevance, restraint, rhetoric, rightness, security,
   seemliness, seventh heaven, silver tongue, simplicity, slickness,
   smiles of fortune, smoothness, straightforwardness, success,
   suitability, sunshine, taste, tastefulness, tendency, terseness,
   the affluent life, the breaks, the good life, thriving condition,
   transport, turn, turn for, unaffectedness, unalloyed happiness,
   upward mobility, urbanity, velvet, vividness, weal, wealth,
   welfare, well-being



U.S. Gazetteer Places (2000):

Felicity, OH -- U.S. village in Ohio
   Population (2000):    922
   Housing Units (2000): 370
   Land area (2000):     0.267183 sq. miles (0.692000 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.267183 sq. miles (0.692000 sq. km)
   FIPS code:            26880
   Located within:       Ohio (OH), FIPS 39
   Location:             38.838689 N, 84.097305 W
   ZIP Codes (1990):     45120
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Felicity, OH
    Felicity