The Collaborative International Dictionary of English v.0.48:

Articulation \Ar*tic`u*la"tion\, n. [Cf. F. articulation, fr. L.
   articulatio.]
   1. (Anat.) A joint or juncture between bones in the skeleton.
      [1913 Webster]

   Note: Articulations may be immovable, when the bones are
         directly united (synarthrosis), or slightly movable,
         when they are united intervening substance
         (amphiarthrosis), or they may be more or less freely
         movable, when the articular surfaces are covered with
         synovial membranes, as in complete joints
         (diarthrosis). The last (diarthrosis) includes hinge
         joints, admitting motion in one plane only (ginglymus),
         ball and socket joints (enarthrosis), pivot and
         rotation joints, etc.
         [1913 Webster]

   2. (Bot.)
      (a) The connection of the parts of a plant by joints, as
          in pods.
      (b) One of the nodes or joints, as in cane and maize.
      (c) One of the parts intercepted between the joints; also,
          a subdivision into parts at regular or irregular
          intervals as a result of serial intermission in
          growth, as in the cane, grasses, etc. --Lindley.
          [1913 Webster]

   3. The act of putting together with a joint or joints; any
      meeting of parts in a joint.
      [1913 Webster]

   4. The state of being jointed; connection of parts. [R.]
      [1913 Webster]

            That definiteness and articulation of imagery.
                                                  --Coleridge.
      [1913 Webster]

   5. The utterance of the elementary sounds of a language by
      the appropriate movements of the organs, as in
      pronunciation; as, a distinct articulation.
      [1913 Webster]

   6. A sound made by the vocal organs; an articulate utterance
      or an elementary sound, esp. a consonant.
      [1913 Webster]

WordNet (r) 3.0 (2006):

articulation
    n 1: the aspect of pronunciation that involves bringing
         articulatory organs together so as to shape the sounds of
         speech
    2: the shape or manner in which things come together and a
       connection is made [syn: articulation, join, joint,
       juncture, junction]
    3: expressing in coherent verbal form; "the articulation of my
       feelings"; "I gave voice to my feelings" [syn:
       articulation, voice]
    4: (anatomy) the point of connection between two bones or
       elements of a skeleton (especially if it allows motion) [syn:
       joint, articulation, articulatio]
    5: the act of joining things in such a way that motion is
       possible

Moby Thesaurus II by Grady Ward, 1.0:

232 Moby Thesaurus words for "articulation":
   Indian file, agglomeration, agglutination, aggregation, allophone,
   alveolar, ankle, antonym, apico-alveolar, apico-dental, array,
   aspiration, assimilation, attack, bank, bilabial, bond, boundary,
   bracketing, butt, buzz, cacuminal, catena, catenation, cerebral,
   cervix, chain, chain reaction, chaining, check, clinch, closure,
   clustering, combination, communication, concatenation, concourse,
   concurrence, confluence, congeries, conglomeration, conjugation,
   conjunction, connecting link, connecting rod, connection,
   consecution, consonant, continuant, continuum, convergence,
   copulation, coupling, course, cycle, delivery, dental, descent,
   diphthong, dissimilation, dovetail, drone, elbow, embrace,
   endless belt, endless round, enunciation, epenthetic vowel,
   explosive, expression, file, filiation, free form, gamut,
   gathering, glide, gliding joint, glottal, glottalization,
   gradation, guttural, hinge, hinged joint, hip, homograph, homonym,
   homophone, hookup, hum, intercommunication, intercourse, interface,
   interlinking, join, joinder, joining, joint, jointure, junction,
   juncture, knee, knotting, knuckle, labial, labialization,
   labiodental, labiovelar, laryngeal, lateral, lexeme, liaison, line,
   lineage, lingual, linguistic form, link, linkage, linking, liquid,
   locution, logos, manner of articulation, marriage, meeting, merger,
   merging, metonym, minimum free form, miter, modification,
   monophthong, monosyllable, monotone, morphophoneme, mortise, mute,
   nasal, neck, nexus, occlusive, pairing, palatal, parasitic vowel,
   peak, pendulum, periodicity, pharyngeal, pharyngealization,
   phonation, phone, phoneme, pivot, pivot joint, plenum, plosive,
   polysyllable, powder train, progression, pronunciation,
   prothetic vowel, queue, rabbet, range, rank, recurrence,
   reticulation, retroflex, rotation, round, routine, row, run, scale,
   scarf, seam, segmental phoneme, semivowel, sequence, series,
   shoulder, single file, sonant, sonority, spectrum, speech sound,
   splice, stitch, stop, string, succession, surd, suture, swath,
   syllabic nucleus, syllabic peak, syllable, symbiosis, symphysis,
   synonym, term, thread, tie, tie rod, tie-in, tie-up, tier, toggle,
   toggle joint, train, transition sound, triphthong, unification,
   union, usage, utterance, velar, verbalism, verbum, vocable,
   vocalic, vocalization, vocoid, voice, voiced sound,
   voiceless sound, voicing, vowel, weld, windrow, word, wrist,
   yoking