Breadcrumb Home > 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: careening Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language