WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / O / operating system operating system noun 16 letters Scrabble 23 WWF 26 Definitions noun software that controls the execution of computer programs and may provide various services os Look “operating system” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →