Are you unaware that the official language of the Catholic Church is Latin?
Here's a short description from the petition submitted to the Pope: When the Church invokes Mary under the title, "Coredemptrix", she means that Mary uniquely participated in the redemption of the human family by Jesus Christ, Our Lord and Saviour. At the Annunciation (cf.Lk.1:38) Mary freely cooperated in giving the Second Person of the Trinity his human body which is the very instrument of redemption, as Scripture tells us: "We have been sanctified through the offering of the body of Jesus Christ once for all" (Heb.10:10).
And at the foot of the cross of our Saviour (Jn.19:26), Mary's intense sufferings, united with those of her Son, as Pope John Paul II tells us, were, "also a contribution to the Redemption of us all" (Salvifici Doloris, n.25). Because of this intimate sharing in the redemption accomplished by the Lord, the Mother of the Redeemer is uniquely and rightly referred to by Pope John Paul II and the Church as the "Coredemptrix."
It is important to note that the prefix "co" in the title Coredemptrix does not mean "equal to" but rather "with", coming from the Latin word cum. The Marian title Coredemptrix never places Mary on a level of equality with her Divine Son, Jesus Christ. Rather it refers to Mary's unique human participation which is completely secondary and subordinate to the redeeming role of Jesus, who alone is true God and true Man.
Again if it was a Latin term it would read “cum Redemptor”. It’s “co -Redemptrix”. Maybe the second one is pig-latin