Interest in or appreciation of Jewish people, their history, or the influence of Judaism, particularly on the part of a gentile.
1881 March, The Eclectic Magazine of Foreign Literature, Science, and Art, page 350:
To an Englishman, German liberalism is a hybrid creature, lame of three legs and blind of one eye, and thus it is necessary to explain — if indeed explanation in its rational sense be possible — the position of the German Liberals in this matter of philo-Semitism.
philo-Semitism on Wikipedia.Wikipedia 