(1):
(a.) Acting in an indirect way.
(2):
(a.) 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.
(3):
(a.) Tending toward the same conclusion or result as something else; additional; as, collateral evidence.
(4):
(a.) Coming from, being on, or directed toward, the side; as, collateral pressure.
(5):
(a.) Descending from the same stock or ancestor, but not in the same line or branch or one from the other; - opposed to lineal.
(6):
(n.) A collateral relative.
(7):
(n.) Collateral security; that which is pledged or deposited as collateral security.