This is the 10512th most frequent Polish word.
decydująca
Decisive.
The word is used as an adjective, meaning 'decisive', to describe an event that was crucial or essential.
To była decydująca chwila w naszym życiu.
This was a decisive moment in our lives.
Here, 'decydująca' modifies 'advantage', signifying a clear and determining factor.
Decydująca przewaga pomogła drużynie wygrać.
The decisive advantage helped the team win.
In this sentence, the word highlights the significance of a determining action or input.