This is the 7672nd most frequent Polish word.
londyn
London.
Here, 'Londyn' is the object of the verb 'odwiedziłem,' indicating the destination of the action.
Odwiedziłem Londyn w zeszłym roku.
I visited London last year.
In this example, 'Londyn' appears in the locative case ('o Londynie') due to its use with the preposition 'o,' indicating the topic of discussion.
Znam wiele historii o Londynie.
I know many stories about London.
In this sentence, 'Londyn' is used as the subject, referring to the city itself as a proper noun.