Definitions of spark:

• noun:   a small fragment of a burning substance thrown out by burning material or by friction
• noun:   Scottish writer of satirical novels (born in 1918)
• noun:   a small but noticeable trace of some quality that might become stronger

  Example: "A spark of interest"

• noun:   brightness and animation of countenance

  Example: "He had a sparkle in his eye"

• noun:   a momentary flash of light
• noun:   electrical conduction through a gas in an applied electric field
• verb:   emit or produce sparks

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

• verb:   put in motion or move to act
• name:  A surname (very rare: popularity rank in the U.S.: #29618)