The Collaborative International Dictionary of English v.0.48:

Gravity \Grav"i*ty\, n.; pl. Gravities. [L. gravitas, fr.
   gravis heavy; cf. F. gravit['e]. See Grave, a., Grief.]
   1. The state of having weight; beaviness; as, the gravity of
      lead.
      [1913 Webster]

   2. Sobriety of character or demeanor. "Men of gravity and
      learning." --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

gravity
    n 1: (physics) the force of attraction between all masses in the
         universe; especially the attraction of the earth's mass for
         bodies near its surface; "the more remote the body the less
         the gravity"; "the gravitation between two bodies is
         proportional to the product of their masses and inversely
         proportional to the square of the distance between them";
         "gravitation cannot be held responsible for people falling
         in love"--Albert Einstein [syn: gravity, gravitation,
         gravitational attraction, gravitational force]
    2: a manner that is serious and solemn [syn: graveness,
       gravity, sobriety, soberness, somberness,
       sombreness]
    3: a solemn and dignified feeling [syn: gravity, solemnity]
       [ant: levity]

Moby Thesaurus II by Grady Ward, 1.0:

129 Moby Thesaurus words for "gravity":
   G, G suit, acuteness, adduction, affinity, allurement,
   apogeotropism, attractance, attraction, attractiveness,
   attractivity, augustness, avoirdupois, beef, beefiness, bleakness,
   buckram, capillarity, capillary attraction, centripetal force,
   ceremonial, ceremoniousness, ceremony, courtliness, darkness,
   deadweight, decorousness, demureness, dignifiedness, dignity,
   dismalness, drag, draw, dreariness, earnestness, elevation,
   exigency, extrinsicality, fatness, form, formality, formalization,
   geotropism, gloom, gloominess, grandeur, gravitation, graviton,
   grimness, gross weight, heaviness, heft, heftiness, immediacy,
   impersonality, importance, kingliness, liveweight, loftiness,
   long face, lordliness, magnetism, magnitude, majesty, mass,
   moderation, momentousness, mutual attraction, neat weight, net,
   net weight, no joke, no laughing matter, nobility, overbalance,
   overweight, pomp, pomposity, ponderability, ponderosity,
   ponderousness, poundage, pride of bearing, pride of place,
   primness, princeliness, proud bearing, pull, pulling power,
   regality, reserve, rigidness, ritual, rituality, sedateness,
   seriousness, severity, significance, sober-mindedness, soberness,
   sobersidedness, sobersides, sobriety, solemnity, solemnness,
   somberness, specific gravity, staidness, starchiness, stateliness,
   stiffness, stiltedness, straight face, stylization, sublimity,
   sympathy, temperance, thoughtfulness, tonnage, traction, tug,
   underweight, urgency, venerability, wearifulness, wearisomeness,
   weight, weightiness, worthiness



U.S. Gazetteer Places (2000):

Gravity, IA -- U.S. city in Iowa
   Population (2000):    218
   Housing Units (2000): 103
   Land area (2000):     0.298808 sq. miles (0.773910 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.298808 sq. miles (0.773910 sq. km)
   FIPS code:            32520
   Located within:       Iowa (IA), FIPS 19
   Location:             40.759096 N, 94.744221 W
   ZIP Codes (1990):     50848
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Gravity, IA
    Gravity