Keys on refer to the process of turning on or activating a device or system. There are various synonyms for the term, such as switch on, power up, start up, ignite, and activate, among others. These words signify the act of initiating a specific process by turning on a device or pressing a button. These synonyms are commonly used in the fields of technology, engineering, and science, where the use of devices and systems is prevalent. Knowing these synonyms can improve communication and understanding of processes, especially when dealing with complex systems that require precise instructions and activations. In summary, keys on refer to the start-up process, and these synonyms can help convey the meaning more accurately and precisely.