/ Dictionary / Index M maximum-security: Meaning and Definition of Find definitions for: max•i•mum-se•cu•ri•ty Pronunciation: (mak'su-mum-si-kyoor'i-tē), [key] — adj. designed for or housing prisoners regarded as being very dangerous to society. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. maximum principle maximum thermometer Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language