1. (law) the act of substituting of one creditor for another
The Collaborative International Dictionary of English v.0.48:
Subrogation \Sub`ro*ga"tion\, n. [Cf. F. subrogation, LL.
The act of subrogating. Specifically: (Law) The substitution
of one person in the place of another as a creditor, the new
creditor succeeding to the rights of the former; the mode by
which a third person who pays a creditor succeeds to his
rights against the debtor. --Bouvier. Burrill. Abbott.