This is the 2522nd most frequent Polish word.
montrealu
"Montrealu" is the locative or genitive case of "Montreal" in Polish, referring to the city of Montreal.
'Montrealu' is the locative case of 'Montreal', used after prepositions indicating location or time, like 'w' (in).
Byłem w Montrealu zeszłego lata.
I was in Montreal last summer.
'Montrealu' is the genitive case of 'Montreal', indicating possession or association, in this case 'the history of'.
Historia Montrealu jest bardzo interesująca.
The history of Montreal is very interesting.
'Montrealu' again shows the genitive case, which is common in expressions of association, such as 'a map of'.