| 4G | - | Fourth Generation |
| ADSL | - | Asymmetric Digital Subscriber Line |
| ASPI | - | All Share Price Index |
| BPM | - | Business Process Management |
| BPO | - | Business Process Outsourcing |
| BPR | - | Business Process Re-engineering |
| BSS | - | Billing Support System |
| CDMA | - | Code Division Multiple Access |
| CEA | - | Communications Enabled Applications |
| CLI | - | Caller Line Identification |
| CRM | - | Customer Relationship Management |
| DC HSPA+ | - | Dual-Carrier High Speed Packet Access |
| DEL | - | Direct Exchange Line |
| E1 | - | E – Carrier System Level 1 |
| EBITDA | - | Earnings Before Interest, Taxes, Depreciation and Amortisation |
| EFTNS | - | External Fixed Telecommunications Network Services |
| EPF | - | Employees’ Provident Fund |
| ERP | - | Enterprise Resource Planning |
| ETA | - | Electronic Travel Authorisation |
| ETF | - | Employees’ Trust Fund |
| FCR | - | Fault Clearance Rate |
| FTTB | - | Fibre-To-The-Building/Business |
| FTTC | - | Fibre-To-The-Curb |
| FTTH | - | Fibre-To-The-Home |
| FTTN | - | Fibre-To-The-Node |
| Gbps | - | Gigabits per second |
| GDP | - | Gross Domestic Product |
| GITR | - | Global Information Technology Report |
| GPS | - | Global Positioning System |
| GRI | - | Global Reporting Initiative |
| GSR | - | Global Symposium for Regulators |
| GTH | - | Global Telecommunications Holdings |
| HDTV | - | High Definition Television |
| HSPA | - | High Speed Packet Access |
| ICT | - | Information and Communication Technologies |
| ICTA | - |
Information and Communication Technology Agency of Sri Lanka |
| IDD | - | International Direct Dialling |
| IFRS | - | International Financial Reporting Standards |
| IGW | - | International Gateway |
| IMS | - | IP Multimedia Subsystem |
| INED | - | Independent Non-Executive Director |
| IoT | - | Internet of Things |
| IP | - | Internet Protocol |
| IP-VPN | - | Internet Protocol Virtual Private Network |
| IPTV | - | Internet Protocol Television |
| ISP | - | Internet Service Provider |
| ITU | - | International Telecommunication Union |
| KPO | - | Knowledge Process Outsourcing |
| KPI | - | Key Performance Indicator |
| LEARN | - | Lanka Education and Research Network |
| LED | - | Light Emitting Diode |
| LGN | - | Lanka Government Network |
| LTE | - | Long-Term Evolution |
| Mbps | - | Megabits per second |
| MEF | - | Metro Ethernet Forum |
| MEN | - | Metro Ethernet Network |
| MIMO | - | Multiple-Input and Multiple-Output |
| MPEG | - | Moving Picture Experts Group |
| MPLS | - | Multiprotocol Label Switching |
| MSAN | - | Multi-Service Access Nodes |
| NBN | - | National Backbone Network |
| NED | - | Non-Executive Director |
| NFC | - | Near Field Communication |
| NGN | - | Next Generation Network |
| NOC | - | Network Operating Centre |
| NRI | - | Network Readiness Index |
| OSS | - | Operational Support System |
| OTT | - | Over the Top |
| PEO TV | - | Personalised Entertainment Option Television |
| PoP | - | Point of Presence |
| PSTN | - | Public Switched Telephone Network |
| PTC | - | Pacific Telecommunications Council |
| RAS | - | Revenue Assurance System |
| SAFA | - | South Asian Federation of Accountants |
| SBN | - | SLT Backbone Network |
| SDH | - | Synchronous Digital Hierarchy |
| SDM | - | Space Division Multiplex |
| SEA ME WE | - | South East Asia-Middle East-West Europe |
| SLBN | - | Sri Lanka Telecom Broadband Network |
| SLFRS | - | Sri Lanka Accounting Standards |
| SLIM | - | Sri Lanka Institute of Marketing |
| SME | - | Small and Medium Enterprise |
| SMS | - | Short Message Service |
| SOA | - | Service Oriented Architecture |
| STM-1 | - | Synchronous Transport Module Level-1 |
| SVOD | - | Subscription Video on Demand |
| TRCSL | - | Telecommunication Regulatory Commission of Sri Lanka |
| UMTS | - | Universal Mobile Telecommunications System |
| VDSL | - | Very High Bit Rate Digital Subscriber Line |
| VoD | - | Video on Demand |
| VoIP | - | Voice over Internet Protocol |
| VPN | - | Virtual Private Network |
| WAP | - | Wireless Access Protocol |
| WiMAX | - | Worldwide Interoperability for Microwave Access |