Definition: "TCNO" stands for "Technology Carrier Network Operator." It's a term used in telecommunications, referring to a network operator responsible for maintaining and managing various components such as equipment, services, infrastructure, and networks. The word "TCNO" describes a telecommunications company that is responsible for the maintenance, upgrade, or expansion of their networks. This can include providing support and troubleshooting services to customers, ensuring that the network's systems are functioning properly, and making sure that all necessary changes and improvements are made to the network.