This is the 423rd most frequent Russian word.
речь
Speech; spoken language.
In this sentence, "речь" is used to mean a delivered speech or discourse presented orally to an audience.
Это была очень интересная речь.
It was a very interesting speech.
Here, "речь" represents the manner of speaking or the style of one's verbal expression.
Он всегда следит за своей речью.
He always pays attention to his speech.
In this usage, "речь" implies the subject or topic of discussion.