This is the 1572nd most frequent Polish word.
ewentualnie
"Possibly" or "alternatively."
In this context, 'ewentualnie' expresses a possible outcome dependent on a condition.
Jeśli będzie brzydka pogoda, ewentualnie zostaniemy w domu.
If the weather is bad, we might possibly stay at home.
Here, 'ewentualnie' is used to suggest an alternative option.
Mogę pójść na zakupy, ewentualnie możemy zamówić jedzenie online.
I can go shopping, or alternatively, we can order food online.
This usage of 'ewentualnie' indicates a contingency or second best option if no better solutions are available.