The Collaborative International Dictionary of English v.0.48:

Socket \Sock"et\, n. [OE. soket, a dim. through OF. fr. L.
   soccus. See Sock a covering for the foot.]
   1. An opening into which anything is fitted; any hollow thing
      or place which receives and holds something else; as, the
      sockets of the teeth.
      [1913 Webster]

            His eyeballs in their hollow sockets sink. --Dryden.
      [1913 Webster]

   2. Especially, the hollow tube or place in which a candle is
      fixed in the candlestick.
      [1913 Webster]

   3. (Electricity) the receptacle of an electric lamp into
      which a light bulb is inserted, containing contacts to
      conduct electricity to the bulb.
      [PJC]

   4. (Electricity) the receptacle fixed in a wall and connected
      by conductive wiring to an electrical supply, containing
      contacts to conduct electricity, and into which the plug
      of an electrical device is inserted; -- called also a
      wall socket or outlet. The socket will typically have
      two or three contacts; if three, the third is connected to
      a ground for safety.
      [PJC]

            And in the sockets oily bubbles dance. --Dryden.
      [1913 Webster]

   Socket bolt (Mach.), a bolt that passes through a thimble
      that is placed between the parts connected by the bolt.

   Socket chisel. Same as Framing chisel. See under
      Framing.

   Socket pipe, a pipe with an expansion at one end to receive
      the end of a connecting pipe.

   Socket pole, a pole armed with iron fixed on by means of a
      socket, and used to propel boats, etc. [U.S.]

   Socket wrench, a wrench consisting of a socket at the end
      of a shank or rod, for turning a nut, bolthead, etc., in a
      narrow or deep recess.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Outlet \Out"let`\, n.
   The place or opening by which anything is let out; a passage
   out; an exit; a vent.
   [1913 Webster]

         Receiving all, and having no outlet.     --Fuller.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Outlet \Out*let"\, v. t.
   To let out; to emit. [R.] --Daniel.
   [1913 Webster]

WordNet (r) 3.0 (2006):

outlet
    n 1: a place of business for retailing goods [syn: mercantile
         establishment, retail store, sales outlet, outlet]
    2: receptacle providing a place in a wiring system where current
       can be taken to run electrical devices [syn: wall socket,
       wall plug, electric outlet, electrical outlet,
       outlet, electric receptacle]
    3: an opening that permits escape or release; "he blocked the
       way out"; "the canyon had only one issue" [syn: exit,
       issue, outlet, way out]
    4: activity that frees or expresses creative energy or emotion;
       "she had no other outlet for her feelings"; "he gave vent to
       his anger" [syn: release, outlet, vent]

Moby Thesaurus II by Grady Ward, 1.0:

146 Moby Thesaurus words for "outlet":
   abreaction, access, acting-out, aisle, alley, ambulatory, aperture,
   arcade, artery, avenue, bill of sale, blowhole, break, breakout,
   broaching, catharsis, cavity, channel, chasm, check, chute,
   clearing, cleft, cloister, colonnade, communication, conduit,
   connection, corridor, covered way, crack, debouch, defile,
   deliverance, delivery, demand, discharge, disclosure, door, egress,
   emergence, emotional release, emunctory, escape, escape hatch,
   escapism, estuary, evasion, exhaust, exit, extrication, fenestra,
   ferry, fistula, flight, floodgate, flume, fontanel, foramen, ford,
   freeing, gallery, gap, gape, gat, getaway, gulf, hiatus, hole,
   hollow, inlet, interchange, intersection, interval, issuance,
   issue, jailbreak, junction, lacuna, lane, laying open, leak,
   leakage, liberation, loophole, market, mass market,
   motor abreaction, opening, opening up, orifice, out, outcome,
   outfall, outgate, outgo, overpass, pass, passage, passageway, pore,
   port, portico, prisonbreak, psychocatharsis, psychodrama,
   purgation, railroad tunnel, release, release therapy, relief,
   rescue, retail, retailer, riddance, sale, sally port, setting-free,
   shop, showroom, slot, sluice, space, spiracle, split, spout, stoma,
   store, tap, throwing open, tie-in, traject, trajet, tunnel,
   turnover, uncorking, underpass, unstopping, vent, ventage,
   venthole, vomitory, way out, weir, wholesale, yawn