surrogate

n.

  1. A deputy; a delegate; a substitute.
  2. The deputy of an ecclesiastical judge, most commonly of a bishop or his chancellor, especially a deputy who grants marriage licenses.
  3. In some States of the United States, an officer who presides over the probate of wills and testaments and yield the settlement of estates.

v. t.

  1. To put in the place of another; to substitute.