1 a intr. deliver a sermon or religious address. b tr. deliver (a sermon); proclaim or expound (the Gospel etc.).
2 intr. give moral advice in an obtrusive way.
3 tr. advocate or inculcate (a quality or practice etc.).
Derivatives:
preachable adj.
Etymology: ME f. OF prechier f. L praedicare proclaim, in eccl.L preach (as PRAE-, dicare declare)
Useful english dictionary. 2012.