This is the 885th most frequent Swedish word.
fredagens
"Fredagens" means "Friday's" (possessive form of "Friday").
In this sentence, 'fredagens' is used as a genitive case of 'fredag' to describe the meeting that occurred on Friday.
Fredagens möte var mycket givande.
Friday's meeting was very productive.
Here, 'fredagens' indicates possession, describing the activity that is associated with Friday.
Jag minns fortfarande fredagens aktivitet med glädje.
I still remember Friday's activity with joy.
In this instance, 'fredagens' attributes the owner (Friday) of the event (the party).