Word not understandable by any non-Polish user. I guess it refers to the 1488 privilege given by King Casimir Jagiellon to Przystyk to hold fairs and markets. Not every user of this page reads the Przystyk page, and even so, it's not certain that that's what is meant by kazimierzowski. (en)
It has grown by 10% over the space of three short paragraphs :) Over there there is no year mentioned. (en)