A lecture is defined as an educational talk given to students, especially at a university, in a lecture hall. Lectures provide supporting information for courses and can also refer to long, serious speeches used to scold or reprimand an audience. To lecture means to deliver an educational talk or lecture, often to a class or audience at a university or to impart knowledge on a topic.

1. WHAT IS A LECTURE?
Definition of lecture
noun
•an educational talk to an audience, especially one of
students in a university: in each course there are
supporting lectures and tutorials [as modifier]:a lecture
hall
•a long serious speech, especially one given as a scolding
or reprimand: the usual lecture on table manners
verb
•1 [no object] deliver an educational lecture or lectures:
he was lecturing at the University of Birmingham
•[with object] give a lecture to (a class or other
audience):he was lecturing future generations of healthservice professionals