Source : Webster's Revised Unabridged Dictionary (1913)

Companion \Com*pan"ion\, n. [F. compagnon, OF. compaing, fr. an
   assumed LL. companio (cf. companium fellowship, a mess), fr.
   L. com- + panis bread. See {Pantry}.]
   1. One who accompanies or is in company with another for a
      longer or shorter period, either from choice or casually;
      one who is much in the company of, or is associated with,
      another or others; an associate; a comrade; a consort; a
      partner.

            The companions of his fall.           --Milton.

            The companion of fools shall smart for it. --Prov.
                                                  xiii. 20 (Rev.
                                                  Ver.).

            Here are your sons again; and I must lose Two of the
            sweetest companions in the world.     --Shak.

            A companion is one with whom we share our bread; a
            messmate.                             --Trench.

   2. A knight of the lowest rank in certain orders; as, a
      companion of the Bath.

   3. A fellow; -- in contempt. [Obs.] --Shak.

   4. [Cf. OSp. compa[~n]a an outhouse, office.] (Naut.)
      (a) A skylight on an upper deck with frames and sashes of
          various shapes, to admit light to a cabin or lower
          deck.
      (b) A wooden hood or penthouse covering the companion way;
          a companion hatch.

   {Companion hatch} (Naut.), a wooden porch over the entrance
      or staircase of the cabin.

   {Companion ladder} (Naut.), the ladder by which officers
      ascend to, or descend from, the quarter-deck. --Totten.

   {Companion way} (Naut.), a staircase leading to the cabin.

   {Knights companions}, in certain honorary orders, the members
      of the lowest grades as distinguished from knights
      commanders, knights grand cross, and the like.

   Syn: Associate; comrade; mate; compeer; partner; ally;
        confederate; coadjutor; accomplice.

Hatch \Hatch\, n. [OE. hacche, AS. h[ae]c, cf. haca the bar of a
   door, D. hek gate, Sw. h["a]ck coop, rack, Dan. hekke manger,
   rack. Prob. akin to E. hook, and first used of something made
   of pieces fastened together. Cf. {Heck}, {Hack} a frame.]
   1. A door with an opening over it; a half door, sometimes set
      with spikes on the upper edge.

            In at the window, or else o'er the hatch. --Shak.

   2. A frame or weir in a river, for catching fish.

   3. A flood gate; a a sluice gate. --Ainsworth.

   4. A bedstead. [Scot.] --Sir W. Scott.

   5. An opening in the deck of a vessel or floor of a warehouse
      which serves as a passageway or hoistway; a hatchway;
      also; a cover or door, or one of the covers used in
      closing such an opening.

   6. (Mining) An opening into, or in search of, a mine.

   {Booby hatch}, {Buttery hatch}, {Companion hatch}, etc. See
      under {Booby}, {Buttery}, etc.

   {To batten down the hatches} (Naut.), to lay tarpaulins over
      them, and secure them with battens.

   {To be under hatches}, to be confined below in a vessel; to
      be under arrest, or in slavery, distress, etc.