This is the 365th most frequent Japanese word.
講演
Lecture or speech.
Here, "講演" is used to describe a formal talk or speech given by an expert or notable figure.
著名な科学者が大学で講演を行った。
A famous scientist gave a lecture at the university.
In this sentence, "講演" refers to the event where the formal talk took place.
その講演は多くの学生が参加して、大いに盛り上がった。
The lecture was attended by many students and was very engaging.
Here, "講演" is used in the context of specifying the content or main topic of the speech.