This Recommendation contains a collection of specialist technical terms@ definitions and abbreviations referenced within oneM2M specifications transposed as ITU-T Recommendations. Having a common collection of definitions and abbreviations related to these Recommendations will: ? ensure that the terminology is used in a consistent manner across the Recommendations; ? provide readers with a 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. This Recommendation contains oneM2M Release 2 specification - oneM2M Common Terminology V2.4.1 and is equivalent to standards of oneM2M partners including ARIB@ ATIS [ATIS.oneM2M.TS0011V241-2016]@ CCSA [CCSA M2M-TS-0011-V2.4.1]@ ETSI [ETSI TS 118 111 V2.4.1]@ TIA@ TSDSI [TSDSI STD T1.oneM2M TS-0011-2.4.1 V1.0.0]@ TTA [TTAT.MM-TS.0011 v2.4.1] and TTC [TTC TS-M2M-0011v2.4.1].