A Special Anniversary of an Event; 50 Years
This page is the CodyCross answer for the clue below from Inventions, Group 53, Puzzle 2.
Question is: A Special Anniversary of an Event; 50 Years
and the answer is: JUBILEE
Word Meaning:
JUBILEE — (countable, Jewish history) A special year of emancipation supposed to be observed every fifty years, when farming was temporarily stopped, certain houses and land which had been sold could be redeemed by the original owners or their relatives, and Hebrew slaves set free.
Definitions from Wiktionary.