The Collaborative International Dictionary of English v.0.48:

Drone \Drone\, n. [OE. drane a dronebee, AS. dr[=a]n; akin to
   OS. dr[=a]n, OHG. treno, G. drohne, Dan. drone, cf. Gr. ? a
   kind of wasp, dial. Gr. ? drone. Prob. named fr. the droning
   sound. See Drone, v. i.]
   1. (Zool.) The male of bees, esp. of the honeybee. It gathers
      no honey. See Honeybee.
      [1913 Webster]

            All with united force combine to drive
            The lazy drones from the laborious hive. --Dryden.
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   2. One who lives on the labors of others; a lazy, idle
      fellow; a sluggard.
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            By living as a drone,to be an unprofitable and
            unworthy member of so noble and learned a society.
                                                  -- Burton.
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   3. That which gives out a grave or monotonous tone or dull
      sound; as:
      (a) A drum. [Obs.] Halliwell.
      (b) The part of the bagpipe containing the two lowest
          tubes, which always sound the key note and the fifth.
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   4. A humming or deep murmuring sound.
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            The monotonous drone of the wheel.    --Longfellow.
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   5. (Mus.) A monotonous bass, as in a pastoral composition.
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The Collaborative International Dictionary of English v.0.48:

Drone \Drone\ (dr[=o]n), v. i. [imp. & p. p. Droned; p. pr. &
   vb. n. Droning.] [Cf. (for sense 1) D. dreunen, G.
   dr["o]hnen, Icel. drynja to roar, drynr a roaring, Sw.
   dr["o]na to bellow, drone, Dan. dr["o]ne, Goth. drunjus
   sound, Gr. ? dirge, ? to cry aloud, Skr. dhran to sound. Cf.
   Drone, n.]
   1. To utter or make a low, dull, monotonous, humming or
      murmuring sound.
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            Where the beetle wheels his droning flight. --T.
                                                  Gray.
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   2. To love in idleness; to do nothing. "Race of droning
      kings." --Dryden.
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WordNet (r) 3.0 (2006):

drone
    n 1: stingless male bee in a colony of social bees (especially
         honeybees) whose sole function is to mate with the queen
    2: an unchanging intonation [syn: monotone, drone,
       droning]
    3: someone who takes more time than necessary; someone who lags
       behind [syn: dawdler, drone, laggard, lagger,
       trailer, poke]
    4: an aircraft without a pilot that is operated by remote
       control [syn: drone, pilotless aircraft, radio-
       controlled aircraft]
    5: a pipe of the bagpipe that is tuned to produce a single
       continuous tone [syn: drone, drone pipe, bourdon]
    v 1: make a monotonous low dull sound; "The harmonium was
         droning on"
    2: talk in a monotonous voice [syn: drone, drone on]

The Jargon File (version 4.4.7, 29 Dec 2003):

drone
 n.

    Ignorant sales or customer service personnel in computer or electronics
    superstores. Characterized by a lack of even superficial knowledge about
    the products they sell, yet possessed of the conviction that they are more
    competent than their hacker customers. Usage: “That video board probably
    sucks, it was recommended by a drone at Fry's” In the year 2000, their
    natural habitats include Fry's Electronics, Best Buy, and CompUSA.