This is the 1516th most frequent Polish word.
wyborcza
"Wyborcza" means "electoral" or "related to elections."
Here 'wyborcza' is the name of a publication, specifically 'Gazeta Wyborcza', where the term 'wyborcza' relates to 'electoral' in context to the origin of the newspaper as it began during an election time.
Gazeta Wyborcza jest znanym polskim dziennikiem.
Gazeta Wyborcza is a well-known Polish daily newspaper.
In this sentence, 'wyborcza' modifies 'kampania' ('campaign'), denoting that the campaign pertains to elections, showing its use in an adjectival form to indicate association with elections.
Kampania wyborcza trwa już od kilku tygodni.
The election campaign has been ongoing for several weeks.
Here, 'wyborcza' describes 'platforma' ('platform'), signifying that the platform is specifically related to elections or the electoral process.