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What does ballast mean?

Looking for the meaning or definition of the word ballast? Here's what it means.

Noun
  1. (nautical) Heavy material that is placed in the hold of a ship (or in the gondola of a balloon), to provide stability.
  2. (figuratively) Anything that steadies emotion or the mind.
  3. Coarse gravel or similar material laid to form a bed for roads or railroads, or in making concrete.
  4. (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.
  5. (countable, electronics) device used for stabilizing current in an electric circuit (e.g.in a tube lamp supply circuit)
  6. (figuratively) That which gives, or helps to maintain, uprightness, steadiness, and security.
Verb
  1. To stabilize or load a ship with ballast.
  2. To lay ballast on the bed of a railroad track.
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