This is the 10788th most frequent Polish word.
dyplomową
"Dyplomową" is the feminine form of the adjective meaning "pertaining to a diploma" or "graduate" (often used in contexts like "thesis" or "project").
Refers to a graduate thesis in an academic context.
Pracuję nad moją pracą dyplomową.
I'm working on my thesis.
Refers to an event associated with graduation or diplomas.
To była wyjątkowa ceremonia dyplomowa.
It was an extraordinary graduation ceremony.
Again, relates to an academic piece of work required for graduation.