1. The act of performing some function in the place of someone else.
2. The process of carrying and delivering a child for another person.
gestational surrogacy. A pregnancy in which one woman (the genetic mother) provides the egg, which is fertilized, and another woman (the surrogate mother) carries the fetus and gives birth to the child.
traditional surrogacy. A pregnancy in which a woman provides her own egg, which is fertilized by artificial insemination, and carries the fetus and gives birth to a child for another person.