This is the 7802nd most frequent Polish word.
mazowieckiego
"Mazowieckiego" means "of Mazowieckie," referring to the Mazowieckie region or voivodeship in Poland.
In this sentence, 'mazowieckiego' is used as an adjective stemming from the name 'Mazowsze,' describing the specific province.
Warszawa jest stolicą województwa mazowieckiego.
Warsaw is the capital of the Mazowieckie province.
Here, 'mazowieckiego' describes the province mentioned, emphasizing its characteristic adjective form due to grammatical agreement.
Odwiedziliśmy piękne kąty województwa mazowieckiego.
We visited beautiful corners of the Mazowieckie province.
In this case, 'mazowieckiego' modifies 'regionu,' relating to the geographical area of Mazowsze and its culinary traditions.