Definition of: preach

(prēch) v.i.
1. To deliver a sermon, as on a religious topic or a text of Scripture.
2. To give advice or instruction, especially persistently and intrusively.
—v.t.
3. To advocate or recommend urgently: to preach temperance.
4. To proclaim; expound upon: to preach the gospel.
5. To deliver (a sermon, etc.). [<OF prechier <L praedicare proclaim <prae- before + dicare make known]