/ Dictionary / Index L lockdown: Meaning and Definition of Find definitions for: lock•down Pronunciation: (lok'doun"), [key] — n. the confining of prisoners to their cells, as following a riot or other disturbance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lockdown (Thesaurus) lockbox Locke Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language