The Collaborative International Dictionary of English v.0.48:

Tie \Tie\, v. t. [imp. & p. p. Tied(Obs. Tight); p. pr. &
   vb. n. Tying.] [OE. ti?en, teyen, AS. t[imac]gan,
   ti['e]gan, fr. te['a]g, te['a]h, a rope; akin to Icel. taug,
   and AS. te['o]n to draw, to pull. See Tug, v. t., and cf.
   Tow to drag.]
   1. To fasten with a band or cord and knot; to bind. "Tie the
      kine to the cart." --1 Sam. vi. 7.
      [1913 Webster]

            My son, keep thy father's commandment, and forsake
            not the law of thy mother: bind them continually
            upon thine heart, and tie them about thy neck.
                                                  --Prov. vi.
                                                  20,21.
      [1913 Webster]

   2. To form, as a knot, by interlacing or complicating a cord;
      also, to interlace, or form a knot in; as, to tie a cord
      to a tree; to knit; to knot. "We do not tie this knot with
      an intention to puzzle the argument." --Bp. Burnet.
      [1913 Webster]

   3. To unite firmly; to fasten; to hold.
      [1913 Webster]

            In bond of virtuous love together tied. --Fairfax.
      [1913 Webster]

   4. To hold or constrain by authority or moral influence, as
      by knotted cords; to oblige; to constrain; to restrain; to
      confine.
      [1913 Webster]

            Not tied to rules of policy, you find
            Revenge less sweet than a forgiving mind. --Dryden.
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   5. (Mus.) To unite, as notes, by a cross line, or by a curved
      line, or slur, drawn over or under them.
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   6. To make an equal score with, in a contest; to be even
      with.
      [1913 Webster]

   To ride and tie. See under Ride.

   To tie down.
      (a) To fasten so as to prevent from rising.
      (b) To restrain; to confine; to hinder from action.

   To tie up, to confine; to restrain; to hinder from motion
      or action.
      [1913 Webster]

WordNet (r) 3.0 (2006):

tied
    adj 1: bound or secured closely; "the guard was found trussed up
           with his arms and legs securely tied"; "a trussed
           chicken" [syn: trussed, tied]
    2: bound together by or as if by a strong rope; especially as by
       a bond of affection; "people tied by blood or marriage"
    3: fastened with strings or cords; "a neatly tied bundle" [syn:
       tied, fastened] [ant: unfastened, untied]
    4: closed with a lace; "snugly laced shoes" [syn: laced,
       tied] [ant: unlaced, untied]
    5: of the score in a contest; "the score is tied" [syn:
       tied(p), even, level(p)]

Moby Thesaurus II by Grady Ward, 1.0:

120 Moby Thesaurus words for "tied":
   affiliate, affiliated, aground, alike, allied, anchored, assembled,
   associate, associated, at par, au pair, banded together, beholden,
   beholden to, bound, bounden, bounden to, bracketed, caught,
   chained, collateral, collected, commensurate, committed, conjoined,
   conjugate, connected, copulate, correlated, coupled, drawn,
   duty-bound, equal, equalized, even, even stephen, fast, fastened,
   fettered, fifty-fifty, fixed, gathered, grounded, half-and-half,
   hampered, hand-in-glove, hand-in-hand, handcuffed, held,
   high and dry, impacted, implicated, in bonds, in chains,
   in duty bound, in irons, incorporated, indebted to, inextricable,
   integrated, interlinked, interlocked, interrelated, intimate,
   involved, ironbound, jammed, joined, knotted, leagued, level, like,
   linked, manacled, matched, mated, merged, moored, nip and tuck,
   obligate, obligated, obliged, obliged to, of that ilk,
   of that kind, on a footing, on a level, on a par, on even ground,
   packed, paired, par, parallel, pledged, proportionate, quits,
   related, saddled, shackled, spliced, square, stalemated, stranded,
   strapped, stuck, stuck fast, tethered, tied down, tied up,
   trammeled, transfixed, twinned, under obligation, undivided,
   united, unseparated, wed, wedded, wedged, yoked