/ Dictionary / Index J Jena: Meaning and Definition of Find definitions for: Je•na Pronunciation: (yā'nä), [key] — n. a city in central Germany: Napoleon decisively defeated the Prussians here in 1806. 103,000. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: jena (Thesaurus) jen je ne sais quoi* Related Content Daily Word Quiz: apogee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language