n. & adj.
--n.
1. security pledged as a guarantee for repayment of a loan.
2 a person having the same descent as another but by a different line.
--adj.
1. descended from the same stock but by a different line.
2 side by side; parallel.
3 a additional but subordinate. b contributory. c connected but aside from the main subject, course, etc.
Derivatives:
collaterality n. collaterally adv.
Etymology: ME f. med.L collateralis (as COM-, LATERAL)