/ Dictionary / Index A astro-inertial guidance: Meaning and Definition of Find definitions for: as'tro-in•er'tial guid'ance Pronunciation: (as'trō-i-nûr'shul). [key] See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. astroid astrol. Related Content Daily Word Quiz: reluctant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language