The hatred of Jewish People based on nothing more than their ethnicity

Anti-Semitism (Wikipedia)

Antisemitism (also spelled anti-semitism or anti-Semitism) is hostility to, prejudice towards, or discrimination against Jews. This sentiment is a form of racism, and a person who harbours it is called an antisemite. Primarily, antisemitic tendencies may be motivated by negative sentiment towards Jews as a people or by negative sentiment towards Jews with regard to Judaism. In the former case, usually presented as racial antisemitism, a person's hostility is driven by the belief that Jews constitute a distinct race with inherent traits or characteristics that are repulsive or inferior to the preferred traits or characteristics within that person's society. In the latter case, known as religious antisemitism, a person's hostility is driven by their religion's perception of Jews and Judaism, typically encompassing doctrines of supersession that expect or demand Jews to turn away from Judaism and submit to the religion presenting itself as Judaism's successor faith—this is a common theme within the other Abrahamic religions. The development of racial and religious antisemitism has historically been encouraged by the concept of anti-Judaism, which is distinct from antisemitism itself.

There are various ways in which antisemitism is manifested, ranging in the level of severity of Jewish persecution. On the more subtle end, it consists of expressions of hatred or discrimination against individual Jews, and may or may not be accompanied by violence. On the most extreme end, it consists of pogroms or genocide, which may or may not be state-sponsored. Although the term "antisemitism" did not come into common usage until the 19th century, it is also applied to previous and later anti-Jewish incidents. Notable instances of antisemitic persecution include the Rhineland massacres in 1096; the Edict of Expulsion in 1290; the European persecution of Jews during the Black Death, between 1348 and 1351; the massacre of Spanish Jews in 1391, the crackdown of the Spanish Inquisition, and the expulsion of Jews from Spain in 1492; the Cossack massacres in Ukraine, between 1648 and 1657; various anti-Jewish pogroms in the Russian Empire, between 1821 and 1906; the Dreyfus affair, between 1894 and 1906; the Holocaust by Nazi Germany during World War II; and various Soviet anti-Jewish policies. Historically, most of the world's violent antisemitic events have taken place in Christian Europe. However, since the early 20th century, there has been a sharp rise in antisemitic incidents across the Arab world, largely due to the surge in Arab antisemitic conspiracy theories, which have been cultivated to an extent under the aegis of European antisemitic conspiracy theories.

In recent times, the idea that there is a variation of antisemitism known as "new antisemitism" has emerged on several occasions. According to this view, since the State of Israel is a Jewish state, expressions of anti-Zionist positions could harbour antisemitic sentiments.

Due to the root word Semite, the term is prone to being invoked as a misnomer by those who incorrectly assert that it refers to racist hatred directed at "Semitic people" in spite of the fact that this grouping is an obsolete historical race concept. Likewise, such usage is erroneous; the compound word antisemitismus was first used in print in Germany in 1879 as a "scientific-sounding term" for Judenhass (lit.'Jew-hatred'), and it has since been used to refer to anti-Jewish sentiment alone.