| Answer | Crossword Clue |
|---|---|
| quadrennials | QUADRENNIAL, an event taking place every four years |
| quadrennial | lasting four years; occurring once every four years / an event taking place every four years |
| quadriennial | taking place every four years |
| quadrennially | QUADRENNIAL, lasting four years; occurring once every four years |
| biyearly | Appearing or taking place every two years or twice a year |
