Here’s some cool history on the word jubilee:
Jubilee comes from the Hebrew yobhel, which was a ram’s horn used as a trumpet. It was blown every fifty years to celebrate the release of the Jews from bondage. The word applies especially to a fiftieth anniversary but is used to mark other anniversaries as well. In 1897, Queen Victoria celebrated her Diamond Jubilee, by which time she had occupied the British throne for sixty years. Interesting, huh?