Terms include:  

• 5G-Sytem (Towards IMT-2020)
• 5G-NR (See also; TR38.912 and the '38. series')
• API Framework for 3GPP Northbound APIs
• Carrier Aggregation,
• Cellular Internet of Things (CIoT - EC-GSM-IoT, LTE-M and NB-IoT)
• Conformance Testing (UE),
• Control and User Plane Separation of EPC nodes (CUPS)
• Coordinated Vulnerability Disclosure (CVD)
• Core Rx Interface Evolution
• Dynamic spectrum sharing (DSS)
• Energy efficiency for 5G
• Enhanced multimedia broadcast and multicast system over LTE (eMBMS)
• Evolved Packet Core (EPC),
• GPRS & EDGE,
• HSPA,
• IMS,
• IMT-2020 (3GPP part)
• System support for Industrial IoT (Vertical_LAN)
• LTE,
• LTE-Advanced,
• NAS Protocol,
• Network Functions Virtualisation, 
• Mission Critical, 
• Rx Interface Evolution,
• SCAS security test cases (Slide 32 on)
• Small Cells/HetNets, 
• SON,
• Telecom Management
• UAS - UAV,
• UMTS,
• UE Category,
• W-CDMA

3GPP Series & technologies

The first two digits of a 3GPP TS or TR number define the spec series; for example LTE radio (E-UTRAN) is defined in the 36 Series.

On this page you can find which technology is [at least partially] aligned with which 3GPP series.

A-Z list of technical terms

The 3GPP Report ‘Vocabulary for 3GPP Specifications’ identifies specialist technical terms used;

• To ensure that editors use terminology that is consistent across specifications.
• To provide a reader with convenient reference for technical terms that are used across multiple documents.

Furthermore, you can check which Spec(s) a term or abbreviation is defined in using ETSI’s TEDDI application. Note that this only shows terms defined in 3GPP TSs and TRs which have already been transposed as ETSI publications.