collateral

a.

  1. Coming from, being on, or directed toward, the side; as, collateral pressure.
  2. Acting in an indirect way.
  3. Related to, but not strictly a part of, the main thing or matter under consideration; hence, subordinate; not chief or principal; as, collateral interest; collateral issues.
  4. Tending toward the same conclusion or result as something else; additional; as, collateral evidence.
  5. Descending from the same stock or ancestor, but not in the same line or branch or one from the other; -- opposed to lineal.

n.

  1. A collateral relative.
  2. Collateral security; that which is pledged or deposited as collateral security.