The Collaborative International Dictionary of English v.0.48:

Lounge \Lounge\ (lounj), v. i. [imp. & p. p. Lounged (lounjd);
   p. pr. & vb. n. Lounging (loun"j[i^]ng).] [OE. lungis a
   tall, slow, awkward fellow, OF. longis, longin, said to be
   fr. Longinus, the name of the centurion who pierced the body
   of Christ, but with reference also to L. longus long. Cf.
   Long, a.]
   To spend time lazily, whether lolling or idly sauntering; to
   pass time indolently; to stand, sit, or recline, in an
   indolent manner.
   [1913 Webster]

         We lounge over the sciences, dawdle through literature,
         yawn over politics.                      --J. Hannay.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lounge \Lounge\, n.
   1. An idle gait or stroll; the state of reclining indolently;
      a place of lounging.
      [1913 Webster]

            She went with Lady Stock to a bookseller's whose
            shop served as a fashionable lounge.  --Miss
                                                  Edgeworth.
      [1913 Webster]

   2. A piece of furniture resembling a sofa, upon which one may
      lie or recline.
      [1913 Webster]

WordNet (r) 3.0 (2006):

lounge
    n 1: an upholstered seat for more than one person [syn: sofa,
         couch, lounge]
    2: a room (as in a hotel or airport) with seating where people
       can wait [syn: lounge, waiting room, waiting area]
    v 1: sit or recline comfortably; "He was lounging on the sofa"
    2: be about; "The high school students like to loiter in the
       Central Square"; "Who is this man that is hanging around the
       department?" [syn: loiter, lounge, footle, lollygag,
       loaf, lallygag, hang around, mess about, tarry,
       linger, lurk, mill about, mill around]

Moby Thesaurus II by Grady Ward, 1.0:

84 Moby Thesaurus words for "lounge":
   antechamber, anteroom, audience chamber, bar, barroom, bed,
   bed down, bum, bum around, cocktail lounge, couch, crawl, curl up,
   dally, divan, do nothing, drift, drinkery, foyer, front room,
   go to bed, go to rest, goldbrick, goof off, greenroom, grovel,
   hang around, idle, languish, lay, laze, lazy, lie, lie around,
   lie down, lie flat, lie limply, lie prone, lie prostrate, loaf,
   lobby, loiter, loiter about, loll, loll around, lollop around,
   lounge around, mooch around, moon, moon around, parlor, pothouse,
   presence chamber, pub, reception room, recline, repose, rest,
   salon, saloon, saloon bar, settee, settle, settle to rest,
   side room, sit around, slack, slouch, slouch around, snug down,
   sofa, sprawl, stand around, studio couch, take it easy,
   take life easy, tap, taproom, tete-a-tete, throne room, vegetate,
   vestibule, waiting room, wardroom