Definition of lectures:
(n) :
A spoken lesson or exposition, usually delivered to a group.
(n) :
(by extension) A class that primarily consists of a (weekly or other regularly held) lecture (as in sense 1), usually at college or university.
(n) :
A berating or scolding, especially if lengthy, formal or given in a stern or angry manner.
(v) :
(ambitransitive) To teach (somebody) by giving a speech on a given topic.
(v) :
(transitive) To preach, to berate, to scold.
(n) :
(obsolete) The act of reading.