- happening every two years: biennial games.
- lasting or enduring for two years: a biennial life cycle.
- completing its normal term of life in two years, flowering and fruiting the second year, as beets or winter wheat.
- any event occurring once in two years.
- a biennial plant.
- occurring every two years
- lasting two years
- a plant, such as the carrot, that completes its life cycle within two years, developing vegetative storage parts during the first year and flowering and fruiting in its second year
- an event that takes place every two years
