This is the 297th most frequent Hebrew word.
רב
"רב" (Rav) means "rabbi," "teacher," or "many/much," depending on context.
Here, 'רב' refers to a religious leader or a rabbi.
הרב בבית הכנסת נושא תפילה.
The rabbi in the synagogue is leading a prayer.
In this context, 'רב' means 'a great amount' or 'much' in Hebrew.
יש לי רב של מידע על הנושא.
I have a great amount of information on the subject.
Here, 'רב' is utilized as part of a description meaning 'intense' or 'substantial' regarding the argument.