The Collaborative International Dictionary of English v.0.48:

Empty \Emp"ty\ (?; 215), a. [Compar. Emptier; superl.
   Emptiest.] [AS. emtig, [ae]mtig, [ae]metig, fr. [ae]mta,
   [ae]metta, quiet, leisure, rest; of uncertain origin; cf. G.
   emsig busy.]
   1. Containing nothing; not holding or having anything within;
      void of contents or appropriate contents; not filled; --
      said of an inclosure, or a container, as a box, room,
      house, etc.; as, an empty chest, room, purse, or pitcher;
      an empty stomach; empty shackles.
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   2. Free; clear; devoid; -- often with of. "That fair female
      troop . . . empty of all good." --Milton.
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            I shall find you empty of that fault. --Shak.
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   3. Having nothing to carry; unburdened. "An empty messenger."
      --Shak.
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            When ye go ye shall not go empty.     --Ex. iii. 21.
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   4. Destitute of effect, sincerity, or sense; -- said of
      language; as, empty words, or threats.
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            Words are but empty thanks.           --Cibber.
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   5. Unable to satisfy; unsatisfactory; hollow; vain; -- said
      of pleasure, the world, etc.
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            Pleas'd in the silent shade with empty praise.
                                                  --Pope.
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   6. Producing nothing; unfruitful; -- said of a plant or tree;
      as, an empty vine.
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            Seven empty ears blasted with the east wind. --Gen.
                                                  xli. 27.
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   7. Destitute of, or lacking, sense, knowledge, or courtesy;
      as, empty brains; an empty coxcomb.
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            That in civility thou seem'st so empty. --Shak.
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   8. Destitute of reality, or real existence; unsubstantial;
      as, empty dreams.
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   Note: Empty is used as the first element in a compound; as,
         empty-handed, having nothing in the hands, destitute;
         empty-headed, having few ideas; empty-hearted,
         destitute of feeling.

   Syn: See Vacant.
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The Collaborative International Dictionary of English v.0.48:

Empty \Emp"ty\, n.; pl. Empties.
   An empty box, crate, cask, etc.; -- used in commerce, esp. in
   transportation of freight; as, "special rates for empties."
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The Collaborative International Dictionary of English v.0.48:

Empty \Emp"ty\, v. t. [imp. & p. p. Emptied; p. pr. & vb. n.
   Emptying.]
   To deprive of the contents; to exhaust; to make void or
   destitute; to make vacant; to pour out; to discharge; as, to
   empty a vessel; to empty a well or a cistern.
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         The clouds . . . empty themselves upon the earth.
                                                  --Eccl. xi. 3.
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The Collaborative International Dictionary of English v.0.48:

Empty \Emp"ty\, v. i.
   1. To discharge itself; as, a river empties into the ocean.
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   2. To become empty. "The chapel empties." --B. Jonson.
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WordNet (r) 3.0 (2006):

empty
    adj 1: holding or containing nothing; "an empty glass"; "an
           empty room"; "full of empty seats"; "empty hours" [ant:
           full]
    2: devoid of significance or point; "empty promises"; "a hollow
       victory"; "vacuous comments" [syn: empty, hollow,
       vacuous]
    3: needing nourishment; "after skipped lunch the men were empty
       by suppertime"; "empty-bellied children" [syn: empty,
       empty-bellied]
    4: emptied of emotion; "after the violent argument he felt
       empty"
    n 1: a container that has been emptied; "return all empties to
         the store"
    v 1: make void or empty of contents; "Empty the box"; "The alarm
         emptied the building" [ant: fill, fill up, make full]
    2: become empty or void of its content; "The room emptied" [syn:
       empty, discharge] [ant: fill, fill up]
    3: leave behind empty; move out of; "You must vacate your office
       by tonight" [syn: vacate, empty, abandon]
    4: remove; "Empty the water"
    5: excrete or discharge from the body [syn: evacuate, void,
       empty]