A function key is a key on a computer or terminal keyboard which can be programmed so as to cause an operating system command interpreter or application program to perform certain actions, a form of soft key. On some keyboards/computers, function keys may have default actions, accessible on power-on.
Surge definition, a strong, wavelike, forward movement, rush, or sweep: the onward surge of an angry mob. See more.
1. a strong, wavelike forward movement, rush, or sweep: the surge of the crowd. 2. a sudden, strong rush or burst: a surge of energy. 3. a strong, swelling, wavelike volume or body of something.