A tuner is a device used to adjust the frequency of a RADIO signal. It is often used to tune in to a specific station. The term 'tuner' can be broken down into two crossword solutions: 'RADIO' (5 letters) and 'DIAL' (4 letters). RADIO tuners are typically found on radios, televisions, and other audio equipment. They allow users to adjust the frequency of the signal to receive a desired station. DIAL tuners are used to manually adjust the frequency of the signal by turning a DIAL.