(finance) A security or guarantee (usually an asset) pledged for the repayment of a loan if one cannot procure enough funds to repay.

(now rare, genealogy) A collateral (not linear) family member.

(anatomy) A branch of a bodily part or system of organs.

(marketing) Printed materials or content of electronic media used to enhance sales of products (short form of collateral material).

(anatomy) A thinner blood vessel providing an alternate route to blood flow in case the main vessel becomes occluded.

(archaic) A contemporary or rival.

Parallel, along the same vein, side by side.

Corresponding; accompanying, concomitant.

Being aside from the main subject, target, or goal.

(genealogy) Of an indirect ancestral relationship, as opposed to lineal descendency.

(finance) Relating to a collateral in the sense of an obligation or security.

(finance) Expensive to the extent of being paid through a loan.

Coming or directed along the side.

Acting in an indirect way.

(biology, of a vascular bundle) Having the phloem and xylem adjacent.