Etymology
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Jena

city of Thuringia, Germany, site of a famous university that dates to 16c.; attested from 9c. as Jani, from Old High German jani "strip of mown grass," ultimately from PIE root *ei- "to go."

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Definitions of Jena

Jena (n.)
the battle in 1806 in which Napoleon decisively defeated the Prussians;
Synonyms: Battle of Jena
From wordnet.princeton.edu