Source : Webster's Revised Unabridged Dictionary (1913)

Caption \Cap"tion\, n. [L. captio, fr. caper to take. In senses
   3 and 4, perhaps confounded in meaning with L. caput a head.
   See {Capacious}.]
   1. A caviling; a sophism. [Obs.]

            This doctrine is for caption and contradiction.
                                                  --Bacon.

   2. The act of taking or arresting a person by judicial
      process. [R.] --Bouvier.

   3. (Law) That part of a legal instrument, as a commission,
      indictment, etc., which shows where, when, and by what
      authority, it was taken, found, or executed. --Bouvier.
      --Wharton.

   4. The heading of a chapter, section, or page. [U. S.]

Source : WordNet®

caption
     n 1: taking exception; especially an quibble based on a captious
          argument; "a mere caption unworthy of a reply"
     2: translation of foreign dialogue of a movie or TV program;
        usually displayed at the bottom of the screen [syn: {subtitle}]
     3: brief description accompanying an illustration [syn: {legend}]
     v : provide with a caption, as of a photograph or a drawing