Ballast (film) definition

(1) Any heavy material used to stabilize a ship or airship

(2) An electrical device for starting and regulating fluorescent and discharge lamps

(3) A resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations)

(4) An attribute that tends to give stability in character and morals; something that steadies the mind or feelings

(5) Coarse gravel laid to form a bed for streets and railroads

(6) Make steady with a ballast