also antisemitism, 1881, from German Antisemitismus, first used by Wilhelm Marr (1819-1904) German radical, nationalist and race-agitator, who founded the Antisemiten-Liga in 1879; see anti- + Semite.
Not etymologically restricted to anti-Jewish theories, actions, or policies, but almost always used in this sense. Those who object to the inaccuracy of the term might try Hermann Adler's Judaeophobia (1881). Anti-Semitic (also antisemitic) and anti-Semite (also antisemite) also are from 1881, like anti-Semitism they appear first in English in an article in The Athenaeum of Sept. 31, in reference to German literature. Jew-hatred is attested from 1881. As an adjective, anti-Jewish is from 1817.
<a href="https://www.etymonline.com/word/anti-Semitic">Etymology of anti-Semitic by etymonline</a>
Harper, D. (n.d.). Etymology of anti-Semitic. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/anti-Semitic