| Answer | Crossword Clue |
|---|---|
| millennium | An anniversary of a thousand years |
| millenniums | An anniversary of a thousand years |
| millennia | An anniversary of a thousand years |
| bimillenaries | A period of two thousand years or a two-thousandth anniversary |
| bimillenary | Of or relating to a period of two thousand years or a two-thousandth anniversary |
| bimillenary | happening every two thousand years / a two thousandth anniversary |
| anniversary | date that follows such an event by a specified period of time measured in units other than years the 6-month anniversary of the accident |
