This is the 4099th most frequent Polish word.
autorki
"Autorki" means "female authors" in English.
In this sentence, 'autorki' refers to multiple female authors who wrote the book. It is used in the nominative case as the subject of the sentence.
Autorki książki przeprowadziły dogłębne badania.
The authors of the book conducted in-depth research.
Here, 'autorkami' is the instrumental case plural form, used to indicate the authors as the participants in an action during the meeting.
Spotkanie z autorkami było bardzo inspirujące.
The meeting with the authors was very inspiring.
In this sentence, the word 'autorkom' is used in the dative case plural form, indicating the authors as the recipients of the gratitude expressed.