The Collaborative International Dictionary of English v.0.48:

Articulate \Ar*tic"u*late\, a. [L. articulatus. See
   Articulata.]
   1. Expressed in articles or in separate items or particulars.
      [Archaic] --Bacon.
      [1913 Webster]

   2. Jointed; formed with joints; consisting of segments united
      by joints; as, articulate animals or plants.
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   3. Distinctly uttered; spoken so as to be intelligible;
      characterized by division into words and syllables; as,
      articulate speech, sounds, words.
      [1913 Webster]

            Total changes of party and articulate opinion.
                                                  --Carlyle.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Articulate \Ar*tic"u*late\, n. (Zool.)
   An animal of the subkingdom Articulata.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Articulate \Ar*tic"u*late\, v. i. [imp. & p. p. Articulated;
   p. pr. & vb. n. Articulating].
   1. To utter articulate sounds; to utter the elementary sounds
      of a language; to enunciate; to speak distinctly.
      [1913 Webster]

   2. To treat or make terms. [Obs.] --Shak.
      [1913 Webster]

   3. To join or be connected by articulation.
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The Collaborative International Dictionary of English v.0.48:

Articulate \Ar*tic"u*late\, v. t.
   1. To joint; to unite by means of a joint; to put together
      with joints or at the joints.
      [1913 Webster]

   2. To draw up or write in separate articles; to
      particularize; to specify. [Obs.]
      [1913 Webster]

   3. To form, as the elementary sounds; to utter in distinct
      syllables or words; to enunciate; as, to articulate
      letters or language. "To articulate a word." --Ray.
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   4. To express distinctly; to give utterance to.
      [1913 Webster]

            Luther articulated himself upon a process that hand
            already begun in the Christian church. --Bibliotheca
                                                  Sacra.
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            To . . . articulate the dumb, deep want of the
            people.                               --Carlyle.
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WordNet (r) 3.0 (2006):

articulate
    adj 1: expressing yourself easily or characterized by clear
           expressive language; "articulate speech"; "an articulate
           orator"; "articulate beings" [ant: inarticulate,
           unarticulate]
    2: consisting of segments held together by joints [syn:
       articulated, articulate] [ant: unarticulated]
    v 1: provide with a joint; "the carpenter jointed two pieces of
         wood" [syn: joint, articulate]
    2: put into words or an expression; "He formulated his concerns
       to the board of trustees" [syn: give voice, formulate,
       word, phrase, articulate]
    3: speak, pronounce, or utter in a certain way; "She pronounces
       French words in a funny way"; "I cannot say `zip wire'"; "Can
       the child sound out this complicated word?" [syn:
       pronounce, articulate, enounce, sound out,
       enunciate, say]
    4: unite by forming a joint or joints; "the ankle bone
       articulates with the leg bones to form the ankle bones"
    5: express or state clearly [syn: articulate, enunciate,
       vocalize, vocalise]

Moby Thesaurus II by Grady Ward, 1.0:

210 Moby Thesaurus words for "articulate":
   Ciceronian, Demosthenian, Demosthenic, Tullian, accouple,
   accumulate, adjust, agglutinate, amass, apprehensible, assemble,
   associate, audible, band, batten, batten down, bolt, bond, bracket,
   breathe, bridge, bridge over, buckle, butt, button, cement, chain,
   chime, chorus, clap together, clasp, clear, cleat, clip,
   cognizable, collect, combine, come out with, communicate,
   comprehensible, comprise, concatenate, conglobulate, conjoin,
   conjugate, connect, contrastive, convey, coordinate, copulate,
   couple, cover, definite, deliver, disclose, distinct, distinctive,
   dovetail, easily understood, easy to understand, eloquent, embrace,
   emit, encompass, enunciate, exoteric, express, facund, fathomable,
   felicitous, fling off, fluent, formulate, free-speaking,
   free-spoken, garrulous, gather, give, give expression,
   give out with, give tongue, give utterance, give voice, glib, glue,
   harmonize, hasp, hearable, hi-fi, high-fidelity, hinge, hitch,
   hook, impart, include, intelligible, jam, join, joint, jointed,
   knot, knowable, latch, lay together, league, let out, link, lip,
   lock, loud-speaking, loud-spoken, lump together, marry, marshal,
   mass, meaningful, merge, methodize, miter, mobilize, mortise, nail,
   oral, order, organize, out with, outspoken, pair, peg, penetrable,
   phonate, phrase, piece together, pin, plain, plain-speaking,
   plain-spoken, plumbable, pour forth, prehensible, present, prolix,
   pronounce, put forth, put in words, put together, rabbet, raise,
   readable, regulate, relate, rivet, roll into one, say, scarf,
   screw, scrutable, set forth, sew, significant, silver,
   silver-tongued, skewer, slick, smooth, smooth-spoken,
   smooth-tongued, snap, soft-speaking, soft-spoken, solder, sonant,
   sound, span, speaking, spellbinding, splice, spoken, staple, stick,
   stick together, stitch, systematize, tack, take in, talkative,
   talking, tape, tell, throw off, tie, toggle, true-speaking,
   understandable, unify, unite, utter, venting, verbalize, viva voce,
   vocalize, voice, voiced, wedge, weld, well-spoken, whisper, word,
   yoke, zipper