/ Dictionary / Index O operating system: Meaning and Definition of Find definitions for: op'erating sys"tem Pronunciation: [key] — Computers. Computers. the collection of software that directs a computer's operations, controlling and scheduling the execution of other programs, and managing storage, input/output, and communication resources. Abbr.: OS Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. operating room operation Related Content Daily Word Quiz: fresco Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language