The Collaborative International Dictionary of English v.0.48:

Convenient \Con*ven"ient\ (?; 277), a. [L. conveniens, -entis,
   suitable, p. pr. of convenire to be suitable, to come. See
   Convene, v. i.]
   1. Fit or adapted; suitable; proper; becoming; appropriate.
      [Archaic]
      [1913 Webster]

            Feed me with food convenient for me.  --Prov. xxx.
                                                  8.
      [1913 Webster]

            Neither filthiness, nor foolish talking, nor
            jesting, which are not convenient.    --Eph. v. 4.
      [1913 Webster]

   2. Affording accommodation or advantage; well adapted to use;
      handly; as, a convenient house; convenient implements or
      tools.
      [1913 Webster]

   3. Seasonable; timely; opportune; as, a convenient occasion;
      a convenient season. --Acts xxiv. 25.
      [1913 Webster]

   4. Near at hand; easy of access. [Colloq.]
      [1913 Webster]

            Hereties used to be brought thither, convenient for
            burning.                              --Thackeray.

   Syn: Fit; suitable; proper; adapted; fitted; suited; handly;
        commodious.
        [1913 Webster]

WordNet (r) 3.0 (2006):

convenient
    adj 1: suited to your comfort or purpose or needs; "a convenient
           excuse for not going" [ant: inconvenient]
    2: large and roomy (`convenient' is archaic in this sense); "a
       commodious harbor"; "a commodious building suitable for
       conventions" [syn: commodious, convenient] [ant:
       incommodious]

Moby Thesaurus II by Grady Ward, 1.0:

110 Moby Thesaurus words for "convenient":
   accessible, adaptable, adjacent, advantageous, advisable,
   all-around, appropriate, at hand, auspicious, available, becoming,
   befitting, close, close at hand, close-by, comfortable, comfy,
   commodious, congruous, contented, convenient to, cozy, cushioned,
   cushiony, cushy, decent, desirable, ductile, easeful,
   easily reached, easy, expedient, favorable, feasible, felicitous,
   fit, fitten, fitting, flexible, foolproof, fortunate, friendly,
   fructuous, good, handy, happy, helpful, homelike, homely, homey,
   immediate, likely, lived-in, lucky, luxurious, malleable,
   manageable, maneuverable, meet, near, nearby, next, nigh,
   of all work, on call, on deck, on hand, on tap, opportune,
   peaceful, pliable, pliant, politic, practical, profitable, proper,
   propinquant, propinquous, propitious, providential, ready,
   ready at hand, recommendable, relaxing, reposeful, restful, right,
   ripe, roomy, seasonable, seemly, serviceable, snug, soft, sortable,
   suitable, timely, to be desired, to hand, tractable, untroublesome,
   useful, versatile, warm, well-timed, wieldable, wieldy, wise,
   worthwhile, yielding