spark

Merriment expressed by a brightness or gleam or animation of countenance.

“he had a sparkle in his eye”

Electrical conduction through a gas in an applied electric field.

A momentary flash of light.

Scottish writer of satirical novels (born in 1918).

A small but noticeable trace of some quality that might become stronger.

“a spark of interest”

“a spark of decency”

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

Put in motion or move to act.

Emit or produce sparks.

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