Biennium vs. Biennial

Bienniumnoun

A period of two years.

Biennialadjective

Happening every two years.

Bienniumnoun

a specified period of two years

‘the budget for the next biennium’;

Biennialadjective

Lasting for two years.

Biennialnoun

A plant that requires two years to complete its life-cycle, germinating and growing in its first year, then producing its flowers and fruit in its second year, after which it usually dies.

Biennialadjective

Happening, or taking place, once in two years; as, a biennial election.

Biennialadjective

Continuing for two years, and then perishing, as plants which form roots and leaves the first year, and produce fruit the second.

Biennialnoun

Something which takes place or appears once in two years; esp. a biennial examination.

Biennialnoun

A plant which exists or lasts for two years.

Biennialnoun

a plant having a life cycle that normally takes two seasons from germination to death to complete; flowering biennials usually bloom and fruit in the second season

Biennialadjective

occurring every second year;

‘they met at biennial conventions’;

Biennialadjective

having a life cycle lasting two seasons;

‘a biennial life cycle’; ‘parsnips and carrots are biennial plants often grown as annuals’; ‘the common buttercup is a popular perennial plant’;

Biennialadjective

taking place every other year

‘the first of a series of biennial exhibitions’;

Biennialadjective

(of a plant) taking two years to grow from seed to fruition and die.

Biennialnoun

a biennial plant.

Biennialnoun

an event celebrated or taking place every two years

‘the top antiques fairs are the Milan and Florence biennials’;