It means Mediator for Christ 1 Tim 2:5The word man does not mean mediator nor vise versa. In no sense of the use of the word man or Hebrew word for Adam can the meaning be used to define the Son who was in whom dwells all the fullness of the Fathers Deity. We use "God" as He has the Fathers very nature in Him. God was the Logos. The radiance of the Fathers glory and the exact imprint of the Fathers very being. Is God a man? There was no Jesus in the beginning. Yes, He is before Adam and even the Angels of God. He is Firstborn of all things. He is before all things. The Father brought into existence all things that were created through, by and for Him.
5 For there is one God, and one mediator between God and men, the man Christ Jesus;
Christ Jesus the Man Mediator was in existence before Adam existed, In fact He was Adams Mediator between him and God, do you dispute that ?