Proportional control refers to a type of control system where the output is directly proportional to the input. If you are looking for synonyms for the term proportional control, there are a few options available. For instance, the terms linear control, gain control, and steady-state control are all synonyms for proportional control. Each of these terms refers to a control system that maintains a steady output level proportional to the input signal. While the specific terminology may vary depending on the industry or field, the basic concept behind proportional control remains the same. Regardless of the term used, proportional control is an essential component in many different types of systems, from industrial machinery to medical devices.