This is the 16045th most frequent Polish word.
tygodniowego
"Weekly" or "of the week."
The word 'tygodniowego' qualifies the project by indicating its timeframe (lasting a week).
To było podsumowanie tygodniowego projektu.
That was a summary of the week-long project.
The word 'tygodniowego' serves as an adjective describing the type of training (weekly).
Mam plan tygodniowego treningu.
I have a weekly training plan.
The word 'tygodniowego' describes the duration of the course (lasting one week).