Looking up...
The professor gave a lecture on quantum physics.
The professor delivered an educational talk about quantum physics.
A formal talk given to an audience, typically in an academic setting.
Students attended a lecture on medieval history.
Students listened to a formal talk about medieval history.
Often given by professors or experts in universities or conferences.
A scolding or reprimand, often given in a stern manner.
After breaking the rules, the coach gave the team a lecture.
The coach scolded the team sternly after they broke the rules.
This usage is less common and more informal.
Be aware that 'lecture' can mean both an educational talk and a scolding, but the academic meaning is more common.
Use 'lecture' in formal contexts like universities or conferences.
From Middle English *lecture*, from Old French *lecture*, from Latin *lectūra* (a reading), from *legere* (to read).
The word 'lecture' can refer to both an educational talk and a scolding, but the academic meaning is more common.