Jubilee/ˈdʒuːbɪliː/ Definition 1 of 3Pro Tip 1/3Specific Anniversaries Jubilee often marks 25th, 50th, 60th, and 70th anniversaries of important events. The city is preparing for its bicentennial jubilee celebration. Pro Tip 2/3Royal Associations Jubilee is frequently used to celebrate the length of a monarch's reign. Preparations for the king's golden jubilee are underway. Pro Tip 3/3Public Celebrations Jubilees often involve public ceremonies, festivities, or commemorations. Stamps were issued to commemorate the national poet's jubilee.