jubilee

noun

1. 1.(Jewish history) A special year of emancipation supposed to be kept every fifty years, when farming was abandoned and Hebrew slaves were set free.
2. 2.A 25th, 40th, 50th, 60th or 70th anniversary.
3. 3.A special year (originally held every hundred years, then fifty, and then fewer) in which remission from sin could be granted as well as indulgences upon making a pilgrimage to Rome.
4. 4.A time of celebration or rejoicing.
5. 5.An occasion of mass manumission from slavery.