Short for introduction, the opening section of a song, book, or presentation that leads into the main content.
Shortened from 'introduction,' from Latin introductio meaning 'a leading in.' The abbreviated form became popular in the 20th century, especially in music and media contexts.
The casual shortening from 'introduction' to 'intro' reflects our culture's impatience - we've abbreviated the very concept of taking time to properly introduce something, preferring quick beginnings.
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