/ Dictionary / Index B bottom time: Meaning and Definition of Find definitions for: bot'tom time" Pronunciation: [key] — Scuba Diving. the total time, in minutes, from the beginning of a descent to the beginning of an ascent. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. bottomry bottom-up Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language