collateral

noun

• 1 [mass noun] something pledged as security for repayment of a loan, to be forfeited in the event of a default: she put her house up as collateral for the bank loan

• 2a person having the same ancestor as another but through a different line.

adjective

• 1additional but subordinate; secondary:the collateral meanings of a word
• euphemistic denoting inadvertent casualties and destruction in civilian areas in the course of military operations:munitions must be able to destroy the target without causing collateral damage collateral casualties

• 2descended from the same stock but by a different line:a collateral descendant of Robert Burns

• 3situated side by side; parallel:collateral veins