[ 'sʌrəgət ]
■ noun a substitute, especially a person deputizing for another in a specific role or office.
↘(in the Christian Church) a bishop's deputy who grants marriage licences.
↘(in the US) a judge in charge of probate, inheritance, and guardianship.
Derivatives
surrogacy noun
Origin
C17: from L. surrogatus , surrogare 'elect as a substitute'.