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.
      [1913 Webster]

   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.
      [1913 Webster]

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.
      [1913 Webster]

   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.
      [1913 Webster]

            To . . . articulate the dumb, deep want of the
            people.                               --Carlyle.
      [1913 Webster]

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]