What does the term anti-Semitism mean and when was the term first used?

The Word antisemitic is slightly older and the first reference dates from 1865. The Word antisemitism dates from 1879. The antisemitic Word means anti-Jewish. The term antisemitism was first used by Wilhelm Marr for his anti-Jewish political movement. He was fed up with being called a Jew-baiter (Judenhetzer) and wanted to show the world that he, too, had an ideology or -ism to solve the world's problems.