The Collaborative International Dictionary of English v.0.48:

linked \linked\ (l[i^][ng]kt), a.
   1.

   1. Associated.
      [PJC]

   2. (Genetics) Exhibiting linkage[5].
      [PJC]

   3. Having a connection.
      [PJC] Linkboy

The Collaborative International Dictionary of English v.0.48:

Link \Link\ (l[i^][ng]k), v. t. [imp. & p. p. Linked
   (l[i^][ng]kt); p. pr. & vb. n. Linking.]
   To connect or unite with a link or as with a link; to join;
   to attach; to unite; to couple.
   [1913 Webster]

         All the tribes and nations that composed it [the Roman
         Empire] were linked together, not only by the same laws
         and the same government, but by all the facilities of
         commodious intercourse, and of frequent communication.
                                                  --Eustace.
   [1913 Webster]

WordNet (r) 3.0 (2006):

linked
    adj 1: connected by a link, as railway cars or trailer trucks
           [syn: coupled, joined, linked]

Moby Thesaurus II by Grady Ward, 1.0:

94 Moby Thesaurus words for "linked":
   affiliate, affiliated, allied, articulated, assembled, associate,
   associated, banded together, bound, bracketed, catenated,
   ceaseless, collateral, collected, concatenated, conjoined,
   conjugate, connected, constant, continual, continued, continuing,
   continuous, copulate, correlated, coupled, cyclical, direct,
   endless, featureless, gapless, gathered, hand-in-glove,
   hand-in-hand, immediate, implicated, incessant, incorporated,
   integrated, interlinked, interlocked, interminable, interrelated,
   intimate, involved, joined, jointless, knotted, leagued, matched,
   mated, merged, monotonous, never-ending, nonstop, of that ilk,
   of that kind, paired, parallel, perennial, periodic, recurrent,
   related, repetitive, round-the-clock, running, seamless, serried,
   smooth, spliced, stable, steady, straight, tied, twenty-four-hour,
   twinned, unbroken, unceasing, undifferentiated, undivided,
   unending, uniform, unintermitted, unintermittent, unintermitting,
   uninterrupted, united, unrelieved, unremitting, unseparated,
   unstopped, wed, wedded, yoked