This is the 6126th most frequent German word.
dagmar
"Dagmar" is a German female given name and does not have a specific definition beyond being a name.
Dagmar is used as a proper noun here, referring to a person's name.
Dagmar hat viel über ihre Reise erzählt.
Dagmar talked a lot about her journey.
Dagmar is used possessively here, indicating ownership or relation to the neighborhood.
Die Häuser in Dagmars Viertel sind sehr alt.
The houses in Dagmar's neighborhood are very old.
Dagmar is the subject of the sentence, denoting the person hosting the party.