Lewis & Short

jūbĭlaeus (jūbĕlaeus; jŭb-, incorrectly), i, m. [ἰωβηλαῖος; Hebr. jōbēl], the year of jubilee among the Jews, in which all slaves were set free and all lands reverted to their former possessors; it took place every fifty years: quinquagesimus annus Cum Jubilaeus adest, Arat. Act. Apost. 2, 677; Hier. in Isa. 16, 58, 6 sq.