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.
noun. verb. The definition of a surge is a sudden gust of something or a very sudden and dramatic increase. 1  An example of a surge is a crowd that suddenly and quickly moves forward.2  An example of a surge is a sudden increase of electric current or voltage.oun. verb. The definition of a surge is a sudden gust of something or a very sudden and dramatic increase. 1  An example of a surge is a crowd that suddenly and quickly moves forward.