lec·ture 
(l
ĕk
ch
ər)
n.1. An exposition of a given subject delivered before an audience or class, as for the purpose of instruction.
2. An earnest admonition or reproof; a reprimand.
v. lec·tured, lec·tur·ing, lec·tures
v.intr. To deliver a lecture or series of lectures.
v.tr.1. To deliver a lecture to (a class or audience).
2. To admonish or reprove earnestly, often at length: always lecturing me about my manners.
[Middle English, a reading, from Old French, from Medieval Latin lēctūra, from Latin lēctus, past participle of legere, to read; see leg- in the Appendix of Indo-European roots.]