spark

(noun) a momentary flash of light. Synonyms: flicker, glint.

(noun) merriment expressed by a brightness or gleam or animation of countenance. Synonyms: sparkle, twinkle, light. Examples: "He had a sparkle in his eye." "There's a perpetual twinkle in his eyes."

(noun) electrical conduction through a gas in an applied electric field. Synonyms: discharge, arc, electric arc, electric discharge.

(noun) a small but noticeable trace of some quality that might become stronger. Examples: "A spark of interest." "A spark of decency."

(noun) Scottish writer of satirical novels (born in 1918). Synonyms: Spark, Muriel Spark, Dame Muriel Spark, Muriel Sarah Spark.

(noun) a small fragment of a burning substance thrown out by burning material or by friction.

(verb) put in motion or move to act. Synonyms: trip, actuate, trigger, activate, set off, spark off, trigger off, touch off. Examples: "Trigger a reaction." "Actuate the circuits."

(verb) emit or produce sparks. Synonyms: sparkle. Example: "A high tension wire, brought down by a storm, can continue to spark."