Source : Webster's Revised Unabridged Dictionary (1913)

Bottom \Bot"tom\ (b[o^]t"t[u^]m), n. [OE. botum, botme, AS.
   botm; akin to OS. bodom, D. bodem, OHG. podam, G. boden,
   Icel. botn, Sw. botten, Dan. bund (for budn), L. fundus (for
   fudnus), Gr. pyqmh`n (for fyqmh`n), Skr. budhna (for
   bhudhna), and Ir. bonn sole of the foot, W. bon stem, base.
   [root]257. Cf. 4th {Found}, {Fund}, n.]
   1. The lowest part of anything; the foot; as, the bottom of a
      tree or well; the bottom of a hill, a lane, or a page.

            Or dive into the bottom of the deep.  --Shak.

   2. The part of anything which is beneath the contents and
      supports them, as the part of a chair on which a person
      sits, the circular base or lower head of a cask or tub, or
      the plank floor of a ship's hold; the under surface.

            Barrels with the bottom knocked out.  --Macaulay.

            No two chairs were alike; such high backs and low
            backs and leather bottoms and worsted bottoms. --W.
                                                  Irving.

   3. That upon which anything rests or is founded, in a literal
      or a figurative sense; foundation; groundwork.

   4. The bed of a body of water, as of a river, lake, sea.

   5. The fundament; the buttocks.

   6. An abyss. [Obs.] --Dryden.

   7. Low land formed by alluvial deposits along a river;
      low-lying ground; a dale; a valley. ``The bottoms and the
      high grounds.'' --Stoddard.

   8. (Naut.) The part of a ship which is ordinarily under
      water; hence, the vessel itself; a ship.

            My ventures are not in one bottom trusted. --Shak.

            Not to sell the teas, but to return them to London
            in the same bottoms in which they were shipped.
                                                  --Bancroft.

   {Full bottom}, a hull of such shape as permits carrying a
      large amount of merchandise.

   9. Power of endurance; as, a horse of a good bottom.

   10. Dregs or grounds; lees; sediment. --Johnson.

   {At bottom}, {At the bottom}, at the foundation or basis; in
      reality. ``He was at the bottom a good man.'' --J. F.
      Cooper.

   {To be at the bottom of}, to be the cause or originator of;
      to be the source of. [Usually in an opprobrious sense.]
      --J. H. Newman.

            He was at the bottom of many excellent counsels.
                                                  --Addison.

   {To go to the bottom}, to sink; esp. to be wrecked.

   {To touch bottom}, to reach the lowest point; to find
      something on which to rest.

Bottom \Bot"tom\, n. [OE. botme, perh. corrupt. for button. See
   {Button}.]
   A ball or skein of thread; a cocoon. [Obs.]

         Silkworms finish their bottoms in . . . fifteen days.
                                                  --Mortimer.

Bottom \Bot"tom\, v. t.
   To wind round something, as in making a ball of thread.
   [Obs.]

         As you unwind her love from him, Lest it should ravel
         and be good to none, You must provide to bottom it on
         me.                                      --Shak.

Bottom \Bot"tom\, a.
   Of or pertaining to the bottom; fundamental; lowest; under;
   as, bottom rock; the bottom board of a wagon box; bottom
   prices.

   {Bottom glade}, a low glade or open place; a valley; a dale.
      --Milton.

   {Bottom grass}, grass growing on bottom lands.

   {Bottom land}. See 1st {Bottom}, n., 7.

Bottom \Bot"tom\, v. t. [imp. & p. p. {Bottomed} (?); p. pr. &
   vb. n. {Bottoming}.]
   1. To found or build upon; to fix upon as a support; --
      followed by on or upon.

            Action is supposed to be bottomed upon principle.
                                                  --Atterbury.

            Those false and deceiving grounds upon which many
            bottom their eternal state].          --South.

   2. To furnish with a bottom; as, to bottom a chair.

   3. To reach or get to the bottom of. --Smiles.

Bottom \Bot"tom\, v. i.
   1. To rest, as upon an ultimate support; to be based or
      grounded; -- usually with on or upon.

            Find on what foundation any proposition bottoms.
                                                  --Locke.

   2. To reach or impinge against the bottom, so as to impede
      free action, as when the point of a cog strikes the bottom
      of a space between two other cogs, or a piston the end of
      a cylinder.

Source : WordNet®

bottom
     adj 1: situated at the bottom or lowest position; "the bottom
            drawer" [syn: {bottom(a)}] [ant: {side(a)}, {top(a)}]
     2: at the bottom; lowest or last; "the bottom price" [syn: {lowest}]
     3: the lowest rank; "bottom member of the class" [syn: {poorest}]

bottom
     n 1: the lower side of anything [syn: {underside}, {undersurface}]
     2: the lowest part of anything; "they started at the bottom of
        the hill"
     3: the fleshy part of the human body that you sit on; "he
        deserves a good kick in the butt"; "are you going to sit
        on your fanny and do nothing?" [syn: {buttocks}, {nates},
        {arse}, {butt}, {backside}, {bum}, {buns}, {can}, {fundament},
         {hindquarters}, {hind end}, {keister}, {posterior}, {prat},
         {rear}, {rear end}, {rump}, {stern}, {seat}, {tail}, {tail
        end}, {tooshie}, {tush}, {behind}, {derriere}, {fanny}, {ass}]
     4: the second half of an inning; while the home team is at bat
        [syn: {bottom of the inning}] [ant: {top}]
     5: a depression forming the ground under a body of water; "he
        searched for treasure on the ocean bed" [syn: {bed}]
     6: low-lying alluvial land near a river [syn: {bottomland}]
     7: a cargo ship; "they did much of their overseas trade in
        foreign bottoms" [syn: {freighter}, {merchantman}, {merchant
        ship}]

bottom
     v 1: provide with a bottom or a seat; "bottom the chairs"
     2: strike the ground, as with a ship's bottom
     3: come to understand [syn: {penetrate}, {fathom}]

Source : Free On-Line Dictionary of Computing

bottom
     
         The least defined element in a given {domain}.
     
        Often used to represent a non-terminating computation.
     
        (In {LaTeX}, bottom is written as {\perp}, sometimes with the
        domain as a subscript).
     
        (1997-01-07)