Definition of "Spark" :

noun: merriment expressed by a brightness or gleam or animation of countenance

"He had a sparkle in his eye."

noun: a momentary flash of light

noun: a small fragment of a burning substance thrown out by burning material or by friction

noun: Scottish writer of satirical novels (born in 1918)

noun: electrical conduction through a gas in an applied electric field

noun: a small but noticeable trace of some quality that might become stronger

"A spark of interest."

verb: put in motion or move to act

verb: emit or produce sparks

"A high tension wire, brought down by a storm, can continue to spark."