Source : Webster's Revised Unabridged Dictionary (1913)

Punctuate \Punc"tu*ate\, v. t. [imp. & p. p. {Punctuated}; p.
   pr. & vb. n. {Punctuating}.] [Cf. F. ponctuer. See
   {Punctual}.]
   To mark with points; to separate into sentences, clauses,
   etc., by points or stops which mark the proper pauses in
   expressing the meaning.

Source : WordNet®

punctuate
     v 1: insert punctuation marks into [syn: {mark}]
     2: to stress, single out as important; "Dr. Jones emphasizes
        exercise in addition to a change in diet" [syn: {stress},
        {emphasize}, {emphasise}, {accent}, {accentuate}]
     3: interrupt periodically; "Her sharp questions punctuated the
        speaker's drone"