The Collaborative International Dictionary of English v.0.48:

Connect \Con*nect"\ (k[o^]n*n[e^]kt"), v. t. [imp. & p. p.
   Connected; p. pr. & vb. n. Connecting.] [L. connectere,
   -nexum; con- + nectere to bind. See Annex.]
   1. To join, or fasten together, as by something intervening;
      to associate; to combine; to unite or link together; to
      establish a bond or relation between.
      [1913 Webster]

            He fills, he bounds, connects and equals all.
                                                  --Pope.
      [1913 Webster]

            A man must see the connection of each intermediate
            idea with those that it connects before he can use
            it in a syllogism.                    --Locke.
      [1913 Webster]

   2. To associate (a person or thing, or one's self) with
      another person, thing, business, or affair.
      [1913 Webster]

   3. To establish a communication link; -- used with with; as,
      his telephone didn't answer, so I connected with him by
      email.
      [PJC]

   4. To electronically or mechanically link (a device) to
      another device, or to link a device to a common
      communication line; -- used with with; as, the installer
      connected our telephones on Monday; I connected my VCR to
      the TV set by myself; the plumber connected a shut-off
      valve to my gas line.
      [PJC]

   Connecting rod (Mach.), a rod or bar joined to, and
      connecting, two or more moving parts; esp. a rod
      connecting a crank wrist with a beam, crosshead, piston
      rod, or piston, as in a steam engine.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

connected \connected\ adj.
   1. p. p. of connect. [Narrower terms: abutting, adjacent,
      adjoining, bordering(prenominal), conterminous,
      coterminous, contiguous] [Narrower terms: adjunctive]
      [Narrower terms: affined] [Narrower terms: attached]
      [Narrower terms: contiguous, in contact] [Narrower
      terms: coupled, joined, linked] [Narrower terms:
      cursive, flowing] [Narrower terms: siamese] [Narrower
      terms: socially connected, well-connected] unconnected
      [WordNet 1.5]

   2. being joined in close association.

   Syn: affiliated, attached.
        [WordNet 1.5]

   3. connected by a conductor so as to allow the flow of
      electric signals. [Narrower terms: wired (vs. wireless)]
      WordNet 1.5]

   4. (Music) legato. staccato

   Syn: flowing, smooth.
        [WordNet 1.5]

   5. associated with or accompanying.

   Syn: associated.
        [WordNet 1.5]

   6. (Computers) stored in, controlled by, or in direct
      communication with a central computer. [Narrower terms:
      on-line (vs. off-line), online, on line(predicate)]

   Syn: machine-accessible.
        [WordNet 1.5]

   7. switched on. [Narrower terms: on-line (vs. off-line),
      online, on line(predicate)]

   Syn: ready, on.
        [WordNet 1.5]

   8. having some relation.

   Syn: related.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

connected
    adj 1: being joined in close association; "affiliated clubs";
           "all art schools whether independent or attached to
           universities" [syn: affiliated, attached,
           connected]
    2: joined or linked together [ant: unconnected]
    3: wired together to an alarm system; "all the window alarms are
       connected"
    4: plugged in; "first check to see whether the appliance is
       connected"
    5: stored in, controlled by, or in direct communication with a
       central computer [syn: machine-accessible, connected]