/ Dictionary / Index N nautical day: Meaning and Definition of Find definitions for: nau'tical day' Pronunciation: [key] a period from noon of one day to noon of the next, used in reckoning time aboard ship. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nautical archaeology nautical mile Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language