1. relating to or marking a period of two thousand years

1. a two-thousandth anniversary or the celebration of such an event

Examples

• The city is planning a bimillennial celebration to mark two thousand years of its founding.
• The bimillennial of the ancient civilization will be commemorated with special exhibitions.
• Scholars gathered for the bimillennial conference on the history of the region.
• The museum released a bimillennial edition of historical documents.
• They are preparing for the bimillennial festivities next year.