Source : Webster's Revised Unabridged Dictionary (1913)

Emptiness \Emp"ti*ness\, n. [From {Empty}.]
   1. The state of being empty; absence of contents; void space;
      vacuum; as, the emptiness of a vessel; emptiness of the
      stomach.

   2. Want of solidity or substance; unsatisfactoriness;
      inability to satisfy desire; vacuity; hollowness; the
      emptiness of earthly glory.

   3. Want of knowledge; lack of sense; vacuity of mind.

            Eternal smiles his emptiness betray.  --Pope.

            The sins of emptiness, gossip, and spite.
                                                  --Tennyson.

Source : WordNet®

emptiness
     n 1: the state of containing nothing [ant: {fullness}]
     2: having an empty stomach
     3: an empty area or space; "the huge desert voids"; "the
        emptiness of outer space"; "without their support he'll be
        ruling in a vacuum" [syn: {void}, {vacancy}, {vacuum}]
     4: the quality of being valueless or futile; "he rejected the
        vanities of the world" [syn: {vanity}]