/ Dictionary / Index A Aldan: Meaning and Definition of Find definitions for: Al•dan Pronunciation: (ul-dän'), [key] — n. a river in the Russian Federation in Asia, flowing NE from the Yabloni Mountains to the Lena. ab. 1500 mi. (2415 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Alda Aldebaran Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language