This is the 2436th most frequent Swedish word.
gårdagens
"Yesterday's"
The word 'gårdagens' in this sentence acts as a possessive adjective referring to 'yesterday,' specifically to the day preceding today, and it describes the meeting by attributing it as belonging to or happening during yesterday.
Gårdagens möte var mycket givande.
Yesterday's meeting was very fruitful.
Here, 'gårdagens' is used to refer to the newspaper published the day before today, functioning as an adjective modifying 'tidning,' indicating possession or relevance to the previous day.
Jag läste gårdagens tidning på morgonen.
I read yesterday's newspaper in the morning.
In this case, 'gårdagens' describes 'väder,' identifying the weather conditions as specific to the prior day, thereby serving as a temporal marker in adjectival form.