bimillennium

Noun bimillennium has 2 senses

• bimillennium(n = noun.time) bimillenary - the 2000th anniversary (or the celebration of it);
is a kind of anniversary, day of remembrance

• bimillennium(n = noun.time) bimillenary - a span of 2000 years;
is a kind of period, period of time, time period
Derived form adjective bimillenial₁