Collateral

Coming from, being on, or directed toward, the side; as, collateral pressure.

Acting in an indirect way.

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.

Tending toward the same conclusion or result as something else; additional; as, collateral evidence.

Descending from the same stock or ancestor, but not in the same line or branch or one from the other; -- opposed to lineal.

A collateral relative.

Collateral security; that which is pledged or deposited as collateral security.

a security pledged for the repayment of a loan

serving to support or corroborate; "collateral evidence"