The Collaborative International Dictionary of English v.0.48:

Seat \Seat\ (s[=e]t), n. [OE. sete, Icel. saeti; akin to Sw.
   s[aum]te, Dan. saede, MHG. s[=a]ze, AS. set, setl, and E.
   sit. [root]154. See Sit, and cf. Settle, n.]
   1. The place or thing upon which one sits; hence; anything
      made to be sat in or upon, as a chair, bench, stool,
      saddle, or the like.
      [1913 Webster]

            And Jesus . . . overthrew the tables of the money
            changers, and the seats of them that sold doves.
                                                  --Matt. xxi.
                                                  12.
      [1913 Webster]

   2. The place occupied by anything, or where any person or
      thing is situated, resides, or abides; a site; an abode, a
      station; a post; a situation.
      [1913 Webster]

            Where thou dwellest, even where Satan's seat is.
                                                  --Rev. ii. 13.
      [1913 Webster]

            He that builds a fair house upon an ill seat
            committeth himself to prison.         --Bacon.
      [1913 Webster]

            A seat of plenty, content, and tranquillity.
                                                  --Macaulay.
      [1913 Webster]

   3. That part of a thing on which a person sits; as, the seat
      of a chair or saddle; the seat of a pair of pantaloons.
      [1913 Webster]

   4. A sitting; a right to sit; regular or appropriate place of
      sitting; as, a seat in a church; a seat for the season in
      the opera house.
      [1913 Webster]

   5. Posture, or way of sitting, on horseback.
      [1913 Webster]

            She had so good a seat and hand she might be trusted
            with any mount.                       --G. Eliot.
      [1913 Webster]

   6. (Mach.) A part or surface on which another part or surface
      rests; as, a valve seat.
      [1913 Webster]

   Seat worm (Zool.), the pinworm.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Seat \Seat\, v. i.
   To rest; to lie down. [Obs.] --Spenser.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Seat \Seat\, v. t. [imp. & p. p. Seated; p. pr. & vb. n.
   Seating.]
   1. To place on a seat; to cause to sit down; as, to seat
      one's self.
      [1913 Webster]

            The guests were no sooner seated but they entered
            into a warm debate.                   --Arbuthnot.
      [1913 Webster]

   2. To cause to occupy a post, site, situation, or the like;
      to station; to establish; to fix; to settle.
      [1913 Webster]

            Thus high . . . is King Richard seated. --Shak.
      [1913 Webster]

            They had seated themselves in New Guiana. --Sir W.
                                                  Raleigh.
      [1913 Webster]

   3. To assign a seat to, or the seats of; to give a sitting
      to; as, to seat a church, or persons in a church.
      [1913 Webster]

   4. To fix; to set firm.
      [1913 Webster]

            From their foundations, loosening to and fro,
            They plucked the seated hills.        --Milton.
      [1913 Webster]

   5. To settle; to plant with inhabitants; as to seat a
      country. [Obs.] --W. Stith.
      [1913 Webster]

   6. To put a seat or bottom in; as, to seat a chair.
      [1913 Webster]

WordNet (r) 3.0 (2006):

seat
    n 1: a space reserved for sitting (as in a theater or on a train
         or airplane); "he booked their seats in advance"; "he sat
         in someone else's place" [syn: seat, place]
    2: the fleshy part of the human body that you sit on; "he
       deserves a good kick in the butt"; "are you going to sit on
       your fanny and do nothing?" [syn: buttocks, nates,
       arse, butt, backside, bum, buns, can,
       fundament, hindquarters, hind end, keister,
       posterior, prat, rear, rear end, rump, stern,
       seat, tail, tail end, tooshie, tush, bottom,
       behind, derriere, fanny, ass]
    3: furniture that is designed for sitting on; "there were not
       enough seats for all the guests"
    4: any support where you can sit (especially the part of a chair
       or bench etc. on which you sit); "he dusted off the seat
       before sitting down"
    5: a center of authority (as a city from which authority is
       exercised)
    6: the location (metaphorically speaking) where something is
       based; "the brain is said to be the seat of reason"
    7: the legal right to sit as a member in a legislative or
       similar body; "he was elected to a seat in the Senate"
    8: a part of a machine that supports or guides another part
    9: the cloth covering for the buttocks; "the seat of his pants
       was worn through"
    v 1: show to a seat; assign a seat for; "The host seated me next
         to Mrs. Smith" [syn: seat, sit, sit down]
    2: be able to seat; "The theater seats 2,000"
    3: place ceremoniously or formally in an office or position;
       "there was a ceremony to induct the president of the Academy"
       [syn: induct, invest, seat]
    4: put a seat on a chair
    5: provide with seats; "seat a concert hall"
    6: place or attach firmly in or on a base; "seat the camera on
       the tripod"
    7: place in or on a seat; "the mother seated the toddler on the
       high chair"