Wrong place to post but i figure you experts would know what the acronym OSS means. Looking for the definition of OSS? Find out what is the full meaning of OSS on christuskirche-kelsterbach.de! 'Object Services Standard' is one option -- get in to view more. Acronym, Definition. OSS, Office of Strategic Services. OSS, Open Source Software. OSS, Open Sound System (Unix digital audio architecture). OSS, Operations.