Spark (U.S. organization) definition

(1) 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"

(2) A momentary flash of light

(3) A small fragment of a burning substance thrown out by burning material or by friction

(4) Scottish writer of satirical novels (born in 1918)

(5) Electrical conduction through a gas in an applied electric field

(6) A small but noticeable trace of some quality that might become stronger

"A spark of interest"

"A spark of decency"

(7) Put in motion or move to act

"Trigger a reaction"

"Actuate the circuits"

(8) Emit or produce sparks

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