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Definition of ballast:

  1. Any heavy matter put into the car of a balloon to give it steadiness.
  2. Any heavy substance, as stone, iron, etc., put into the hold to sink a vessel in the water to such a depth as to prevent capsizing.
  3. Fig.: That which gives, or helps to maintain, uprightness, steadiness, and security.
  4. Gravel, broken stone, etc., laid in the bed of a railroad to make it firm and solid.
  5. The larger solids, as broken stone or gravel, used in making concrete.
  6. To fill in, as the bed of a railroad, with gravel, stone, etc., in order to make it firm and solid.
  7. To keep steady; to steady, morally.
  8. To steady, as a vessel, by putting heavy substances in the hold.

Synonyms:

light ballast, barretter, counterbalance, counterweight, weight, ballast resistor.

Usage examples: