This is the 1874th most frequent Polish word.
marta
The Polish word "marta" refers to a *marten*, a small carnivorous mammal.
Marta is used as a proper noun, specifically the name of a person.
Marta jest moją najlepszą przyjaciółką.
Marta is my best friend.
Again, 'Marta' is used as a proper noun referring to the subject of the sentence.
Marta zawsze przychodzi na czas.
Marta always arrives on time.
In this sentence, 'martą' is used in an instrumental form to describe how the action is being carried out.