What Is Preaching?

1Co 9:18 What is my reward then? That when I preach the gospel, I may present the gospel of Christ without charge, that I may not abuse my authority in the gospel. (NKJV) 

Tit 1:3 but has in due time manifested His word through preaching, which was committed to me according to the commandment of God our Savior;

Biblical preaching is the verbal act of presenting and manifesting God's truth. The preacher then is the presentor and manifestator of God's Word.