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NOS is an acronym that can stand for various terms depending on the context, such as National Ocean Service, Nitric Oxide Synthase, or Not on Schedule. See the full list of definitions of NOS in alphabetical order and learn how to use it in different fields. Learn the difference between "piece" and " nos ", two terms that are often confused or used interchangeably. "Piece" refers to a single item or part of something, while " nos " is an abbreviation for "numbers", often used to specify quantity or inventory items. NOS is a common acronym that can stand for various meanings, such as Not Otherwise Specified, Network Operating System, or Nitric Oxide Synthase. See the full list of definitions and categories for NOS on The Free Dictionary website. Looking for the definition of NOS ? Find out what is the full meaning of NOS on Abbreviations.com! 'New Old Stock' is one option -- get in to view more @ The Web's largest and most authoritative acronyms and abbreviations resource.