subrogation

Concise Oxford English Dictionary © 2008 Oxford University Press:
subrogation /ˌsʌbrəˈgeɪʃ(ə)n/

▶noun Law the substitution of one person or group by another in respect of a debt or insurance claim, accompanied by the transfer of any associated rights and duties.

– derivatives
subrogate /ˈsʌbrəgeɪt/ verb.

– origin ME (in the general sense ‘substitution’): from late L. subrogatio(n-), from subrogare ‘choose as substitute’.