This is the 13410th most frequent Russian word.
наибольшая
"Наибольшая" means "the greatest" or "the largest."
Here, "наибольшая" is used to describe the highest measure in relation to mountains.
Наибольшая гора в этой области — Эльбрус.
The largest mountain in this area is Elbrus.
In this context, "наибольшая" conveys the meaning of the largest or the most significant profit in comparison.
Эта компания имеет наибольшую прибыль в прошлом квартале.
This company had the greatest profit last quarter.
Here, "наибольшую" is used to express a superlative degree of importance that is given to the subject.