The Swung note reference article from the English Wikipedia on 24-Apr-2004
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Swung note

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Musically, swing can be either: A rhythmic device, swing or shuffle is an augmentation of the initial note in a pair and diminution of the second. Notes which are not swung are straight (no shuffle).

Mostly common this is done with eight notes and ranges anywhere from treating the initial eighth as a triplet quarter note to a dotted eighth (hard shuffle). However, it is usually considered ideally as in between both feelings.

When the initial and final eighth note form a ratio of:

Since a swung note is actually not a note of that length, some musicians consider this term a misnomer.

Swing is commonly used in blues, country, jazz, Swing (genre), and often in many other styles.