"Intelligence derived from electromagnetic non-communication systems by other than the intended recipients or users" defines which term?

The definition provided in the question accurately describes ELINT, which stands for Electronic Intelligence. ELINT focuses on the collection and analysis of data from electromagnetic non-communication systems, such as radar signals and other electronic emissions, that are intercepted by entities other than those intended to receive or use the information. This type of intelligence helps in understanding the capabilities and operations of foreign military systems.

In the context of electronic warfare, ELINT plays a crucial role by providing insight into enemy capabilities and vulnerabilities. By analyzing the characteristics of various electronic systems, analysts can infer details about their operation and effectiveness, which can be pivotal in planning military operations and countermeasures.

The other terms—in particular, COMINT (Communications Intelligence) relates to the interception and analysis of communication signals specifically intended for communication purposes, and SIGINT (Signals Intelligence) encompasses both ELINT and COMINT, thus including any intelligence gathered from intercepted signals—are distinct from the definition provided. RINT is also less commonly referred to and does not have a widely recognized definition in this context.