Source : Webster's Revised Unabridged Dictionary (1913)

Collaterally \Col*lat"er*al*ly\, adv.
   1. Side by side; by the side.

            These pulleys . . . placed collaterally. --Bp.
                                                  Wilkins.

   2. In an indirect or subordinate manner; indirectly.

            The will hath force upon the conscience collaterally
            and indirectly.                       --Jer. Taylor.

   3. In collateral relation; not lineally.