1. property or other assets pledged by a borrower as security for the repayment of a loan: He gave the bank stocks and bonds as collateral for the money he borrowed.
2. Anatomy.
• a subordinate or accessory part.
• a side branch, as of a blood vessel or nerve.
• collateral circulation.
3. a relative descended from the same stock, but in a different line.

4. accompanying; auxiliary: He received a scholarship and collateral aid.
5. additional; confirming: collateral evidence;collateral security.
6. secured by collateral: a collateral loan.
7. aside from the main subject, course, etc.; secondary: These accomplishments are merely collateral to his primary goal.
8. descended from the same stock, but in a different line; not lineal: A cousin is a collateral relative.
9. pertaining to those so descended.
10. situated at the side: a collateral wing of a house.
11. situated or running side by side; parallel: collateral ridges of mountains.
12. standing side by side.

• security pledged for the repayment of a loan
• (as modifier)
2. a person, animal, or plant descended from the same ancestor as another but through a different line

3. situated or running side by side
4. descended from a common ancestor but through different lines
5. serving to support or corroborate
6. aside from the main issue
7. uniting in tendency

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