1. Bilingual: of or pertaining to two languages. For example, a country that has two languages as its official language or an individual who knows how to speak two languages such as French and English.
2. Biopsy: an examination of a piece of living tissue. This is usually done by a medical professional to diagnose or determine whether or not the living cells or tissues are in proper condition and working well.
3. Binocular: pertaining to two eyes. This is mainly related to an optical instrument or device that has two eyes or viewpoints for determining a distance.
4. Biennial or biannual: taking place every two years. Any activity or event that occurs in a progression of two is said to be biennial or biannual.
5. Bigamy: being married to two people at the same time. It is a situation in which an individual legally gets married to two different people.
