1) Go-between 2) Intercessor 3) Intermediary 4) Intermediator 5) Mediator 6) Title of Mary 
The title `Mediatrix` is used in Roman Catholic Mariology to refer to the intercessory role of the Virgin Mary as a mediator in the salvific redemption by her son Jesus Christ, and that he bestows graces through her. Mediatrix is an ancient title that has been used by a number of saints since at least the 5th century. Its use grew during the Mid.....
• (n.) A female mediator.
[n] - a woman who is a mediator
mediatrix 1. A female mediator.2. Often applied to the Virgin Mary, believed in many Christian denominations (especially, the Roman Catholic Church) to intercede with God on behalf of mankind.
the role of the Blessed Virgin Mary as a (female human) mediator in the salvation process, `This intercessory role is to be so understood that it neither takes away from nor adds anything to the dignity and efficaciousness of Christ the one Mediator.
noun a woman who is a mediator