1. (noun)flicker, spark, glint a momentary flash of light
2. (noun)sparkle, twinkle, spark, 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"
3. (noun)discharge, spark, arc, electric arc, electric discharge electrical conduction through a gas in an applied electricfield
4. (noun)spark a small but noticeable trace of some quality that might become stronger "a spark of interest"; "a spark of decency"
5. (noun)Spark, Muriel Spark, Dame Muriel Spark, Muriel Sarah Spark Scottishwriter of satirical novels (born in 1918)
7. (verb)trip, actuate, trigger, activate, set off, spark off, spark, trigger off, touch off put in motion or move to act "trigger a reaction"; "actuate the circuits"
8. (verb)spark, sparkle emit or produce sparks "A high tension wire, brought down by a storm, can continue to spark"
Definition of spark 
