/ Dictionary / Index A astern: Meaning and Definition of Find definitions for: a•stern Pronunciation: (u-stûrn'), [key] — adv. in a position behind a specified vessel or aircraft: The cutter was following close astern. in a backward direction: The steamer went astern at half speed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: astern (Thesaurus) asterism asternal Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language