The Collaborative International Dictionary of English v.0.48:

Sit \Sit\, v. i. [imp. Sat(Sate, archaic); p. p. Sat
   (Sitten, obs.); p. pr. & vb. n. Sitting.] [OE. sitten,
   AS. sittan; akin to OS. sittian, OFries. sitta, D. zitten, G.
   sitzen, OHG. sizzen, Icel. sitja, SW. sitta, Dan. sidde,
   Goth. sitan, Russ. sidiete, L. sedere, Gr. ???, Skr. sad.
   [root]154. Cf. Assess,Assize, Cathedral, Chair,
   Dissident, Excise, Insidious, Possess, Reside,
   Sanhedrim, Seance, Seat, n., Sedate, 4th Sell,
   Siege, Session, Set, v. t., Sizar, Size,
   Subsidy.]
   1. To rest upon the haunches, or the lower extremity of the
      trunk of the body; -- said of human beings, and sometimes
      of other animals; as, to sit on a sofa, on a chair, or on
      the ground.
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            And he came and took the book put of the right hand
            of him that sate upon the seat.       --Bible (1551)
                                                  (Rev. v. 7.)
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            I pray you, jest, sir, as you sit at dinner. --Shak.
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   2. To perch; to rest with the feet drawn up, as birds do on a
      branch, pole, etc.
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   3. To remain in a state of repose; to rest; to abide; to rest
      in any position or condition.
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            And Moses said to . . . the children of Reuben,
            Shall your brothren go to war, and shall ye sit
            here?                                 --Num. xxxii.
                                                  6.
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            Like a demigod here sit I in the sky. --Shak.
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   4. To lie, rest, or bear; to press or weigh; -- with on; as,
      a weight or burden sits lightly upon him.
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            The calamity sits heavy on us.        --Jer. Taylor.
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   5. To be adjusted; to fit; as, a coat sits well or ill.
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            This new and gorgeous garment, majesty,
            Sits not so easy on me as you think.  --Shak.
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   6. To suit one well or ill, as an act; to become; to befit;
      -- used impersonally. [Obs.] --Chaucer.
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   7. To cover and warm eggs for hatching, as a fowl; to brood;
      to incubate.
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            As the partridge sitteth on eggs, and hatcheth them
            not.                                  --Jer. xvii.
                                                  11.
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   8. To have position, as at the point blown from; to hold a
      relative position; to have direction.
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            Like a good miller that knows how to grind, which
            way soever the wind sits.             --Selden.
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            Sits the wind in that quarter?        --Sir W.
                                                  Scott.
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   9. To occupy a place or seat as a member of an official body;
      as, to sit in Congress.
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   10. To hold a session; to be in session for official
       business; -- said of legislative assemblies, courts,
       etc.; as, the court sits in January; the aldermen sit
       to-night.
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   11. To take a position for the purpose of having some
       artistic representation of one's self made, as a picture
       or a bust; as, to sit to a painter.
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   To sit at, to rest under; to be subject to. [Obs.] "A
      farmer can not husband his ground so well if he sit at a
      great rent". --Bacon.

   To sit at meat or To sit at table, to be at table for
      eating.

   To sit down.
       (a) To place one's self on a chair or other seat; as, to
           sit down when tired.
       (b) To begin a siege; as, the enemy sat down before the
           town.
       (c) To settle; to fix a permanent abode. --Spenser.
       (d) To rest; to cease as satisfied. "Here we can not sit
           down, but still proceed in our search." --Rogers.

   To sit for a fellowship, to offer one's self for
      examination with a view to obtaining a fellowship. [Eng.
      Univ.]

   To sit out.
       (a) To be without engagement or employment. [Obs.] --Bp.
           Sanderson.
       (b) To outstay.
       (c) To elect not to participate in, as a dance or a hand
           of cards.

   To sit under, to be under the instruction or ministrations
      of; as, to sit under a preacher; to sit under good
      preaching.

   To sit up, to rise from, or refrain from, a recumbent
      posture or from sleep; to sit with the body upright; as,
      to sit up late at night; also, to watch; as, to sit up
      with a sick person. "He that was dead sat up, and began to
      speak." --Luke vii. 15.
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The Collaborative International Dictionary of English v.0.48:

Sitting \Sit"ting\, a.
   Being in the state, or the position, of one who, or that
   which, sits.
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The Collaborative International Dictionary of English v.0.48:

Sitting \Sit"ting\, n.
   1. The state or act of one who sits; the posture of one who
      occupies a seat.
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   2. A seat, or the space occupied by or allotted for a person,
      in a church, theater, etc.; as, the hall has 800 sittings.
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   3. The act or time of sitting, as to a portrait painter,
      photographer, etc.
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   4. The actual presence or meeting of any body of men in their
      seats, clothed with authority to transact business; a
      session; as, a sitting of the judges of the King's Bench,
      or of a commission.
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            The sitting closed in great agitation. --Macaulay.
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   5. The time during which one sits while doing something, as
      reading a book, playing a game, etc.
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            For the understanding of any one of St. Paul's
            Epistles I read it all through at one sitting.
                                                  --Locke.
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   6. A brooding over eggs for hatching, as by fowls.
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            The male bird . . . amuses her [the female] with his
            songs during the whole time of her sitting.
                                                  --Addison.
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   Sitting room, an apartment where the members of a family
      usually sit, as distinguished from a drawing-room, parlor,
      chamber, or kitchen.
      [1913 Webster] Situate

WordNet (r) 3.0 (2006):

sitting
    adj 1: (of persons) having the torso erect and legs bent with
           the body supported on the buttocks; "the seated Madonna";
           "the audience remained seated" [syn: seated, sitting]
           [ant: standing]
    2: not moving and therefore easy to attack; "a sitting target"
    n 1: (photography) the act of assuming a certain position (as
         for a photograph or portrait); "he wanted his portrait
         painted but couldn't spare time for the sitting" [syn:
         sitting, posing]
    2: the act of assuming or maintaining a seated position; "he
       read the mystery at one sitting"
    3: a meeting of spiritualists; "the seance was held in the
       medium's parlor" [syn: seance, sitting, session]
    4: a session as of a legislature or court

Moby Thesaurus II by Grady Ward, 1.0:

97 Moby Thesaurus words for "sitting":
   assemblee, assembly, assignation, at home, audience, ball,
   bargaining, bargaining session, bigness, brawl, brooding, caucus,
   colloquium, commission, committee, conclave, concourse, confab,
   confabulation, conference, confrontation, congregation, congress,
   consultation, conventicle, convention, convocation, council,
   council fire, council of war, covering, dance, date, diet,
   discussion, eisteddfod, exchange of views,
   eyeball-to-eyeball encounter, festivity, fete, forgathering, forum,
   gathering, gestation, get-together, gravidity, gravidness,
   greatness, heaviness, high-level talk, housewarming, huddle,
   in a huddle, in conclave, in conference, in consultation,
   in council, in session, incubation, interchange of views,
   interview, levee, mediumism, meet, meeting, necromancy,
   negotiations, news conference, palaver, panel, parley, party,
   plenum, pourparler, powwow, pregnancy, press conference, prom,
   quorum, rally, reception, rendezvous, seance, session, shindig,
   sit-in, soiree, spirit, spiritism, spiritualism, summit,
   summit conference, summitry, symposium, synod, the family way,
   turnout



Easton's 1897 Bible Dictionary:

Sitting
   the attitude generally assumed in Palestine by those who were
   engaged in any kind of work. "The carpenter saws, planes, and
   hews with his hand-adze, sitting on the ground or upon the plank
   he is planning. The washerwoman sits by the tub; and, in a word,
   no one stands when it is possible to sit. Shopkeepers always
   sit, and Levi sitting at the receipt of custom (Matt. 9:9) is
   the exact way to state the case.", Thomson, Land and Book.