Biennial (adjective)

1. Occurring once every two years; lasting for two years.
2. Having a life cycle or period of growth that lasts two years.

Origin:

From late latin biennis, from latin bi- ("two") + annus ("yea.r")

Examples:

1. The biennial event showcases the latest in technology and innovation.
2. A biennial plant has a life cycle of two years.
3. The biennial budget is presented to the government every two years.
4. The biennial competition is the largest event of its kind in the world.
5. The biennial festival takes place every two years and is eagerly awaited by music lovers.