This is the 2614th most frequent Polish word.
waszyngtonie
"Waszyngtonie" means "Washington" in the locative case in Polish, used to indicate location (e.g., "in Washington").
In this sentence, 'Waszyngtonie' is the locative form of the proper noun 'Waszyngton', indicating the place where the action occurred.
Byłem w Waszyngtonie w zeszłym roku.
I was in Washington last year.
Here, 'Waszyngtonie' is used as the locative case following the preposition 'o', which requires this grammatical case.
Mówiła o sytuacji w Waszyngtonie.
She talked about the situation in Washington.
In this example, 'Waszyngtonie' again is in the locative case, indicating the location where the event will take place.