The Milky Way contains several binary stars, each consisting of two stars orbiting each other. Binary has many uses, most of them in technical terms. All their information is kept in this form. The great biennial show of new art usually either puzzled or angered the critics. Biennial conventions, celebrations, competitions, and sports events come every two years.
Biennials are plants that live two years, bearing flowers and fruit only in the second year.
Maybe we should stop using both of them until we can decide. Our bipolar earth spins on an axis that extends between the North and the South Pole. The Cold War arms race was bipolar, since it mainly involved the opposing powers of the United States and Russia. Evolutionism and creationism are bipolar views on the history of life, the two major opposing beliefs on the subject in America. And manic-depressive illness, in which the person swings between the two extremes of high excitation and deep depression, is now often called bipolar disorder.