The Collaborative International Dictionary of English v.0.48:

Facility \Fa*cil"i*ty\ (f[.a]*s[i^]l"[i^]*t[y^]), n.; pl.
   Facilities (f[.a]*s[i^]l"[i^]*t[i^]z). [L. facilitas, fr.
   facilis easy: cf. F. facilit['e]. See Facile.]
   1. The quality of being easily performed; freedom from
      difficulty; ease; as, the facility of an operation.
      [1913 Webster]

            The facility with which government has been
            overturned in France.                 --Burke.
      [1913 Webster]

   2. Ease in performance; readiness proceeding from skill or
      use; dexterity; as, practice gives a wonderful facility in
      executing works of art.
      [1913 Webster]

   3. Easiness to be persuaded; readiness or compliance; --
      usually in a bad sense; pliancy.
      [1913 Webster]

            It is a great error to take facility for good
            nature.                               --L'Estrange.
      [1913 Webster]

   4. Easiness of access; complaisance; affability.
      [1913 Webster]

            Offers himself to the visits of a friend with
            facility.                             --South.
      [1913 Webster]

   5. That which promotes the ease of any action or course of
      conduct; advantage; aid; assistance; -- usually in the
      plural; as, special facilities for study.

   Syn: Ease; expertness; readiness; dexterity; complaisance;
        condescension; affability.

   Usage: Facility, Expertness, Readiness. These words
          have in common the idea of performing any act with
          ease and promptitude. Facility supposes a natural or
          acquired power of dispatching a task with lightness
          and ease. Expertness is the kind of facility acquired
          by long practice. Readiness marks the promptitude with
          which anything is done. A merchant needs great
          facility in dispatching business; a banker, great
          expertness in casting accounts; both need great
          readiness in passing from one employment to another.
          "The facility which we get of doing things by a custom
          of doing, makes them often pass in us without our
          notice." --Locke. "The army was celebrated for the
          expertness and valor of the soldiers." "A readiness to
          obey the known will of God is the surest means to
          enlighten the mind in respect to duty."
          [1913 Webster]

WordNet (r) 3.0 (2006):

facility
    n 1: a building or place that provides a particular service or
         is used for a particular industry; "the assembly plant is
         an enormous facility" [syn: facility, installation]
    2: skillful performance or ability without difficulty; "his
       quick adeptness was a product of good design"; "he was famous
       for his facility as an archer" [syn: adeptness,
       adroitness, deftness, facility, quickness]
    3: a natural effortlessness; "they conversed with great
       facility"; "a happy readiness of conversation"--Jane Austen
       [syn: facility, readiness]
    4: something designed and created to serve a particular function
       and to afford a particular convenience or service; "catering
       facilities"; "toilet facilities"; "educational facilities"
    5: a service that an organization or a piece of equipment offers
       you; "a cell phone with internet facility"

Moby Thesaurus II by Grady Ward, 1.0:

254 Moby Thesaurus words for "facility":
   WC, abandon, ability, ableness, accommodation, accouterments,
   adaptability, address, adeptness, adequacy, adroitness, advantage,
   agency, agreeability, agreeableness, aid, airmanship, alacrity,
   amenability, amenity, apparatus, appliance, appliances,
   appointments, appurtenance, appurtenances, aptitude, aptness,
   armament, artfulness, artisanship, artistry, atelier, barbershop,
   beauty parlor, beauty shop, bench, bendability, bent, biddability,
   bog, bravura, brightness, brilliance, butcher shop, caliber,
   capability, capableness, capacity, celerity, cleverness, comfort,
   command, company, competence, complex, compliableness, concern,
   control, convenience, conveniences, coordination, corporation,
   craft, craftsmanship, cunning, deftness, desk, dexterity,
   dexterousness, dextrousness, diplomacy, docility, drive,
   ductibility, ductility, duffel, ease, easiness, educability,
   efficacy, efficiency, effortlessness, elasticity, elegance, engine,
   enginery, equipage, equipment, establishment, expertise,
   expertness, extendibility, extensibility, facilities, faculty,
   fictility, finesse, firm, fitness, fitting, fittings, fixture,
   fixtures, flair, flexibility, flexility, flexuousness, flow,
   fluency, formativeness, furnishings, furniture, gear, genius, give,
   grace, gracefulness, grip, handiness, head, horsemanship, house,
   impedimenta, impressionability, ingeniousness, ingenuity,
   installation, installations, institution, intelligence, john, kit,
   know-how, lavatory, leaning, lightness, limberness, litheness,
   loft, loo, machine, machinery, malleability, marksmanship,
   masterfulness, mastership, mastery, materiel, mechanical aid,
   mechanical device, mechanism, moldability, motivation,
   motive power, motor, munition, munitions, organization, outfit,
   paraphernalia, parlor, plant, plasticity, pliability, pliancy,
   plumbing, poetry, poise, power plant, power source,
   practical ability, privy, proficiency, propensity, prowess,
   qualification, quickness, readiness, receptiveness, receptivity,
   resource, resourcefulness, responsiveness, rest room, rig, rigging,
   savoir-faire, savvy, seamanship, sensibility, sensitiveness,
   sequacity, servility, shop, skill, skillfulness, smoothness, speed,
   spontaneity, springiness, stock-in-trade, structure, studio, style,
   submissiveness, subservience, sufficiency, suppleness,
   susceptibility, sweatshop, swiftness, system, tackle, tact,
   tactfulness, talent, teachability, teachableness,
   technical brilliance, technical mastery, technical skill,
   technique, tensileness, tensility, the goods, the stuff, things,
   timing, toilet, tractability, tractility, trainableness, turn,
   unconstraint, utensils, utility, virtuosity, what it takes,
   willingness, willowiness, wit, wizardry, work site, work space,
   workbench, workhouse, working space, workmanship, workplace,
   workroom, workshop, worktable, yieldingness