This is the 12796th most frequent Russian word.
крупнейшей
"Крупнейшей" means "largest" or "major" in English.
In this sentence, 'крупнейшей' is used as an adjective in the instrumental case, agreeing with the feminine noun 'столицей' (capital), and it conveys the superlative of the word 'крупная' (large).
Москва является крупнейшей столицей в России.
Moscow is the largest capital in Russia.
Here, 'крупнейшей' corresponds to the feminine noun 'задачей' (task) in the instrumental case, emphasizing its significance or magnitude in the context.
Крупнейшей задачей для команды стало развитие нового продукта.
The largest task for the team became the development of the new product.
In this instance, 'крупнейшей' highlights the prominence of Tokyo's economy on a global level, functioning as an adjective in the superlative.