intro
     n 1: formally making a person known to another or to the public
          [syn: {presentation}, {introduction}]
     2: a brief introductory passage to a piece of popular music
Source: WordNet® 2.0

intro n. [{demoscene}] Introductory {screen} of some production. 2. A
   short {demo}, usually showing just one or two {screen}s. 3. Small,
   usually 64k, 40k or 4k {demo}. Sizes are generally dictated by {compo}
   rules. See also {dentro}, {demo}.


Source: The Jargon File