Source : Webster's Revised Unabridged Dictionary (1913)

Drill \Drill\, v. t. [imp. & p. p. {Drilled}; p. pr. & vb. n.
   {Drilling}.] [D. drillen to bore, drill (soldiers); probably
   akin to AS. pyrlian, pyrelian, to pierce. See {Thrill}.]
   1. To pierce or bore with a drill, or a with a drill; to
      perforate; as, to drill a hole into a rock; to drill a
      piece of metal.

   2. To train in the military art; to exercise diligently, as
      soldiers, in military evolutions and exercises; hence, to
      instruct thoroughly in the rudiments of any art or branch
      of knowledge; to discipline.

            He [Frederic the Great] drilled his people, as he
            drilled his grenadiers.               -- Macaulay.

Drill \Drill\, v. t. [Cf. {Trill} to trickle, {Trickle},
   {Dribble}, and W. rhillio to put in a row, drill.]
   1. To cause to flow in drills or rills or by trickling; to
      drain by trickling; as, waters drilled through a sandy
      stratum. [R.] --Thomson.

   2. To sow, as seeds, by dribbling them along a furrow or in a
      row, like a trickling rill of water.

   3. To entice; to allure from step; to decoy; -- with on.
      [Obs.]

            See drilled him on to five-fifty.     -- Addison.

   4. To cause to slip or waste away by degrees. [Obs.]

            This accident hath drilled away the whole summer. --
                                                  Swift.

Drill \Drill\, v. i.
   To practice an exercise or exercises; to train one's self.

Drill \Drill\, n.
   1. An instrument with an edged or pointed end used for making
      holes in hard substances; strictly, a tool that cuts with
      its end, by revolving, as in drilling metals, or by a
      succession of blows, as in drilling stone; also, a drill
      press.

   2. (Mil.) The act or exercise of training soldiers in the
      military art, as in the manual of arms, in the execution
      of evolutions, and the like; hence, diligent and strict
      instruction and exercise in the rudiments and methods of
      any business; a kind or method of military exercises; as,
      infantry drill; battalion drill; artillery drill.

   3. Any exercise, physical or mental, enforced with regularity
      and by constant repetition; as, a severe drill in Latin
      grammar.

   4. (Zo["o]l.) A marine gastropod, of several species, which
      kills oysters and other bivalves by drilling holes through
      the shell. The most destructive kind is {Urosalpinx
      cinerea}.

   {Bow drill}, {Breast drill}. See under {Bow}, {Breast}.

   {Cotter drill}, or {Traverse drill}, a machine tool for
      drilling slots.

   {Diamond drill}. See under {Diamond}.

   {Drill jig}. See under {Jig}.

   {Drill pin}, the pin in a lock which enters the hollow stem
      of the key.

   {Drill sergeant} (Mil.), a noncommissioned officer whose
      office it is to instruct soldiers as to their duties, and
      to train them to military exercises and evolutions.

   {Vertical drill}, a drill press.

Drill \Drill\, n. [Cf. {Mandrill}.] (Zo["o]l.)
   A large African baboon ({Cynocephalus leucoph[ae]us}).

Drill \Drill\, v. i.
   1. To trickle. [Obs. or R.] --Sandys.

   2. To sow in drills.

Drill \Drill\, n.
   1. A small trickling stream; a rill. [Obs.]

            Springs through the pleasant meadows pour their
            drills.                               --Sandys.

   2. (Agr.)
      (a) An implement for making holes for sowing seed, and
          sometimes so formed as to contain seeds and drop them
          into the hole made.
      (b) A light furrow or channel made to put seed into
          sowing.
      (c) A row of seed sown in a furrow.

Drill \Drill\, n. [Usually in pl.] (Manuf.)
   Same as {Drilling}.

   {Imperial drill}, a linen fabric having two threads in the
      warp and three in the filling.

Source : WordNet®

drill
     v 1: make a hole with a pointed power or hand tool; "don't drill
          here, there's a gas pipe"; "drill a hole into the wall";
          "drill for oil" [syn: {bore}]
     2: train in the military, e.g., in the use of weapons
     3: learn by repetition; "We drilled French verbs every day";
        "Pianists practice scales" [syn: {exercise}, {practice}, {practise}]
     4: teach by repetition
     5: undergo military training or do military exercises

drill
     n 1: a tool with a sharp point and cutting edges for making holes
          in hard materials (usually rotating rapidly or by
          repeated blows)
     2: similar to the mandrill but smaller and less brightly
        colored [syn: {Mandrillus leucophaeus}]
     3: systematic training by multiple repetitions; "practice makes
        perfect" [syn: {exercise}, {practice}, {practice session},
         {recitation}]
     4: (military) the training of soldiers to march (as in
        ceremonial parades) or to perform the manual of arms