This is the 4981st most frequent Russian word.
крупнейший
Largest.
In this sentence, 'крупнейшим' serves as an ordinal superlative adjective describing Moscow as the largest city among others in Russia.
Москва является крупнейшим городом России.
Moscow is the largest city in Russia.
Here, 'Крупнейший' modifies 'университет,' indicating the institution as the largest among those available in the country.
Крупнейший университет в стране принимает студентов из разных регионов.
The largest university in the country accepts students from various regions.
In this context, 'крупнейшие,' used in plural form, describes the scope and size of the companies as being the largest on a global scale.