Collateral

1. Parallel, along the same vein, side by side.
2. Corresponding; accompanying, concomitant.
3. Being aside from the main subject, target, or goal.

Synonyms: tangential, subordinate, ancillary

5. (genealogy) Of an indirect ancestral relationship, as opposed to lineal descendency.
6. (finance) Relating to a collateral in the sense of an obligation or security.
7. (finance) Expensive to the extent of being paid through a loan.
8. Coming or directed along the side.
9. Acting in an indirect way.
10. (biology, of a vascular bundle) Having the phloem and xylem adjacent.