The Collaborative International Dictionary of English v.0.48:

Geniality \Ge`ni*al"i*ty\, n. [L. genialitas.]
   The quality of being genial; sympathetic cheerfulness; warmth
   of disposition and manners.
   [1913 Webster]

WordNet (r) 3.0 (2006):

geniality
    n 1: a disposition to be friendly and approachable (easy to talk
         to) [syn: affability, affableness, amiability,
         amiableness, bonhomie, geniality]

Moby Thesaurus II by Grady Ward, 1.0:

94 Moby Thesaurus words for "geniality":
   affability, agreeability, agreeableness, amenity, amiability,
   amicability, ardency, bliss, blissfulness, blitheness,
   blithesomeness, bonhomie, brightness, cheer, cheerfulness,
   cheeriness, cheery vein, civility, clubbability, clubbishness,
   clubbism, communicativeness, companionability, compatibility,
   complaisance, congeniality, cordiality, courtesy, enjoyableness,
   eupeptic mien, familiarity, felicitousness, fondness for society,
   friendliness, generosity, gentleness, gladness, gladsomeness,
   good cheer, good disposition, good humor, good nature, good temper,
   goodliness, goodnaturedness, goodness, goodtemperedness,
   graciousness, gratefulness, gregariousness, happiness,
   harmoniousness, heartiness, hopefulness, hospitableness,
   hospitality, intimacy, lenity, liberality, mellifluousness,
   mellowness, mildness, neighborliness, niceness, open door,
   openheartedness, optimism, pleasance, pleasantness, pleasantry,
   pleasingness, pleasurability, pleasurableness, pleasure,
   pleasurefulness, radiance, rapport, receptiveness,
   rosy expectation, sanguine humor, sanguineness, sociability,
   sociableness, social grace, sociality, sunniness, sweetness,
   sweetness and light, urbanity, warmheartedness, warmness, warmth,
   welcomeness, winsomeness