/ Dictionary / Index P positional astronomy: Meaning and Definition of Find definitions for: posi'tional astron'omy Pronunciation: [key] astrometry. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. position positional notation Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language