definition of
spark

[1] #1 spark v. [trip, actuate, trigger, activate, set off, spark off, trigger off, touch off] put in motion or move to act; "trigger a reaction"; "actuate the circuits". wn

[2] #2 spark n. [flicker, glint] a momentary flash of light. wn

[3] #3 spark n. [sparkle, twinkle, light] 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". wn

[4] #4 spark n. [discharge, arc, electric arc, electric discharge] electrical conduction through a gas in an applied electric field. wn

[5] #5 spark v. [sparkle] emit or produce sparks; "A high tension wire, brought down by a storm, can continue to spark". wn