From WordNet (r) 2.0 (August 2003) [wn]:
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
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Intro- \In"tro-\ [L. intro, adv., inwardly, within. See
Inter-.]
A prefix signifying within, into, in, inward; as, introduce,
introreception, introthoracic.
[1913 Webster]
From Jargon File (4.4.4, 14 Aug 2003) [jargon]:
intro
n.
[demoscene] Introductory screen of some production.
2. A short demo, usually showing just one or two screens.
3. Small, usually 64k, 40k or 4k demo. Sizes are generally dictated
by compo rules. See also dentro, demo.