This is the 4555th most frequent Russian word.
главную
"Main" or "primary."
главную is used here as an adjective paired with 'роль', showcasing its role as the descriptor of 'main' or 'principal'.
Она играет главную роль в исполнении этого плана.
She plays the main role in executing this plan.
Here, 'главную' modifies 'задачу', demonstrating its function in specifying 'primary' or 'important' in context.
Надо сосредоточиться на главную задачу.
One must focus on the main task.
In this case, 'главную' serves to describe 'улицу' as 'main' or 'central,' emphasizing importance within the context.