n. merriment expressed by a brightness or gleam or animation of countenance; "he had a sparkle in his eye"; "there's a perpetual twinkle in his eyes"

n. a momentary flash of light

n. a small fragment of a burning substance thrown out by burning material or by friction

n. electrical conduction through a gas in an applied electric field

n. a small but noticeable trace of some quality that might become stronger; "a spark of interest"; "a spark of decency"

v. put in motion or move to act; "trigger a reaction"; "actuate the circuits"

v. emit or produce sparks; "A high tension wire, brought down by a storm, can continue to spark"