Definitions from Wiktionary (ballast)

▸ noun:  (nautical) Heavy material that is placed in the hold of a ship (or in the gondola of a balloon), to provide stability.
▸ noun:  (figurative) Anything that steadies emotion or the mind.
▸ noun:  Coarse gravel or similar material laid to form a bed for roads or railroads, or in making concrete; track ballast.
▸ noun:  (construction) A material, such as aggregate or precast concrete pavers, which employs its mass and the force of gravity to hold single-ply roof membranes in place.
▸ noun:  (countable, electricity, electronics) device used for stabilizing current in an electric circuit (e.g. in a tube lamp supply circuit)
▸ noun:  (figurative) That which gives, or helps to maintain, uprightness, steadiness, and security.
▸ verb:  To stabilize or load a ship with ballast.
▸ verb:  To lay ballast on the bed of a railroad track.
▸ verb:  To weigh down with a ballast.
▸ Also see ballast

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