noun

A period of two thousand years or a two-thousandth anniversary.

Icons, bibles, paintings, sculptures and other objects serve as resonant symbols of the religion that marked its bimillenary in the year 2000.

adjective

Relating to a period of two thousand years or a two-thousandth anniversary.

He also promised to continue carrying out the Second Vatican Council, ‘in the wake of my predecessors and in faithful continuity with the bimillenary tradition of the church.’