The Collaborative International Dictionary of English v.0.48:

Cage \Cage\, n. [F. cage, fr. L. cavea cavity, cage, fr. cavus
   hollow. Cf. Cave, n., Cajole, Gabion.]
   [1913 Webster]
   1. A box or inclosure, wholly or partly of openwork, in wood
      or metal, used for confining birds or other animals.
      [1913 Webster]

            In his cage, like parrot fine and gay. --Cowper.
      [1913 Webster]

   2. A place of confinement for malefactors --Shak.
      [1913 Webster]

            Stone walls do not a prison make,
            Nor iron bars a cage.                 --Lovelace.
      [1913 Webster]

   3. (Carp.) An outer framework of timber, inclosing something
      within it; as, the cage of a staircase. --Gwilt.
      [1913 Webster]

   4. (Mach.)
      (a) A skeleton frame to limit the motion of a loose piece,
          as a ball valve.
      (b) A wirework strainer, used in connection with pumps and
          pipes.
          [1913 Webster]

   5. The box, bucket, or inclosed platform of a lift or
      elevator; a cagelike structure moving in a shaft.
      [1913 Webster]

   6. (Mining) The drum on which the rope is wound in a hoisting
      whim.
      [1913 Webster]

   7. (Baseball) The catcher's wire mask.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Cage \Cage\ (k[=a]j), v. i. [imp. & p. p. Caged (k[=a]jd); p.
   pr. & vb. n. Caging.]
   To confine in, or as in, a cage; to shut up or confine.
   "Caged and starved to death." --Cowper.
   [1913 Webster]

WordNet (r) 3.0 (2006):

cage
    n 1: an enclosure made or wire or metal bars in which birds or
         animals can be kept [syn: cage, coop]
    2: something that restricts freedom as a cage restricts movement
    3: United States composer of avant-garde music (1912-1992) [syn:
       Cage, John Cage, John Milton Cage Jr.]
    4: the net that is the goal in ice hockey
    5: a movable screen placed behind home base to catch balls
       during batting practice [syn: batting cage, cage]
    v 1: confine in a cage; "The animal was caged" [syn: cage,
         cage in]

The Free On-line Dictionary of Computing (19 January 2023):

CAGE

   Early system on IBM 704.  Listed in CACM 2(5):16 (May 1959).