The present document contains a collection of specialist technical terms@ definitions and abbreviations referenced within the oneM2M specifications. Having a common collection of definitions and abbreviations related to oneM2M documents will: ? ensure that the terminology is used in a consistent manner across oneM2M documents; ? provide a reader with convenient reference for technical terms that are used across multiple documents. The present document provides a tool for further work on oneM2M technical documentation and facilitates their understanding. The definitions and abbreviations as given in the present document are either externally created and included here@ or created internally within oneM2M by the oneM2M TP or its working groups@ whenever the need for precise vocabulary is identified or imported from existing documentation. In addition in oneM2M Technical Specifications and Technical Reports there are also clauses dedicated for locally unique definitions and abbreviations.