“Antisemitism (alternatively spelled anti-semitism or anti-Semitism) is hostility toward or prejudice against Jews as a religious, ethnic, or racial group, which can range in expression from individual hatred to institutionalized, violent persecution.”
Anti-Semitism – Wikipedia , the free encyclopedia
So says Wikipedia and most dictionaries.
In reality anti-semitism is all of the above plus anybody who happens to disagree with anything, including the policies practiced by the government of Israel, kosher slaughter, dislike or disagreement with somebody who just happens to be a Jew, insult financial institutions/bankers, or perhaps you dispute the amount of Jewish deaths in World …