This is the 714th most frequent Czech word.
závěr
Conclusion.
In this instance, 'závěr' refers to the concluding part or summary of something, specifically of a presentation.
Jeho závěr prezentace nás všechny překvapil.
His conclusion in the presentation surprised us all.
Here, 'závěr' is used in the sense of a decision or resolution reached after consideration or discussion.
Po dlouhé diskusi jsme dospěli k závěru.
After a long discussion, we reached a conclusion.
Here, 'závěr' is used to mean 'end', referring to the conclusion of a temporal period, in this case, the week.