This is the 7813th most frequent Polish word.
mańkowską
"Mańkowską" does not have a specific definition; it appears to be a proper noun or surname in Polish.
Here, 'Mańkowską' is a surname in its accusative form, referring to a person being visited.
Pani Mańkowską odwiedziłem wczoraj.
I visited Mrs. Mańkowską yesterday.
In this sentence, 'Mańkowską' indicates ownership and is part of a possessive structure referring to someone's dress.
Podoba mi się sukienka Mańkowską.
I like the dress owned by Mańkowską.
'Mańkowską' is used in its instrumental case form to indicate the person the communication is directed towards.