Definition from Wiktionary, the free dictionary
introduction (plural introductions)
- The act or process of introducing.
- A means, such as a personal letter, of presenting one person to another.
- An initial section of a book or article, which introduces the subject material.
act or process of introducing
means of presenting one person to another
initial section of a book or article which introduces subject material
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Derived terms 
introduction f (plural introductions)