The Collaborative International Dictionary of English v.0.48:

Accessible \Ac*cess"i*ble\, a. [L. accessibilis, fr. accedere:
   cf. F. accessible. See Accede.]
   1. Easy of access or approach; approachable; as, an
      accessible town or mountain, an accessible person.
      [1913 Webster]

   2. Open to the influence of; -- with to. "Minds accessible to
      reason." --Macaulay.
      [1913 Webster]

   3. Obtainable; to be got at.
      [1913 Webster]

            The best information . . . at present accessible.
                                                  --Macaulay.
      [1913 Webster]

WordNet (r) 3.0 (2006):

accessible
    adj 1: capable of being reached; "a town accessible by rail"
           [ant: inaccessible, unaccessible]
    2: capable of being read with comprehension; "readily accessible
       to the nonprofessional reader"; "the tales seem more
       approachable than his more difficult novels" [syn:
       accessible, approachable]
    3: easily obtained; "most students now have computers
       accessible"; "accessible money"
    4: easy to get along with or talk to; friendly; "an accessible
       and genial man"

Moby Thesaurus II by Grady Ward, 1.0:

119 Moby Thesaurus words for "accessible":
   adaptable, affirmed, all-around, amenable, announced, approachable,
   at hand, attainable, attendant, available, broadcast,
   brought to notice, candid, circulated, come-at-able,
   common knowledge, common property, communicative, convenient,
   conversable, current, declared, demonstrative, diffused,
   disseminated, distributed, effusive, employable, expansive,
   extroverted, findable, frank, free, free-speaking, free-spoken,
   free-tongued, getatable, gettable, gossipy, handy, immanent,
   immediate, impressionable, in circulation, in print, in view,
   indwelling, influenceable, inherent, made public, malleable,
   movable, newsy, obtainable, of all work, on board, on call,
   on deck, on hand, on tap, open, open to, open-minded, openable,
   operative, outgoing, outspoken, penetrable, permeable, persuadable,
   persuasible, pervious, plastic, pliable, pliant, practicable,
   present, proclaimed, procurable, propagated, public, published,
   reachable, ready, receptive, reported, responsive, securable,
   self-revealing, self-revelatory, sociable, spread, stated,
   suasible, suggestible, susceptible, swayable, talkative, telecast,
   televised, to be had, to hand, unconstrained, unhampered,
   unrepressed, unreserved, unrestrained, unrestricted, unreticent,
   unsecretive, unshrinking, unsilent, unsuppressed, usable,
   versatile, weak, within call, within reach, within sight