Definition of "Collateral" :

noun: a security pledged for the repayment of a loan

adjective: occurring with or following as a consequence

"Collateral target damage from a bombing run."

adjective: descended from a common ancestor but through different lines

"Cousins are collateral relatives."

adjective: situated or running side by side

"Collateral ridges of mountains."

adjective: additional but secondary; auxiliary

adjective: serving to support or corroborate

"Collateral evidence."