/ Dictionary / Index A Atna: Meaning and Definition of Find definitions for: At•na Pronunciation: (ät'nu), [key] — n. Ahtna. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. atmospheric window at. no. Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language