| A | B |
|---|
| universe | All the matter and space that exists, considered as a whole, the cosmos |
| billion | In the United States, one thousand million: 1,000,000,000 |
| binoculars | Any optical device, such as a microscope or a pair of field glasses, designed for use by both eyes at once and consisting of two small telescopes. |
| tripod | An adjustable stand with three legs, used especially to support a camera. |
| unique | Having no equal or equivalent; being the only one in kind |
| unison | In music, the combination of two or more tones of the same pitch sounding at the same time |
| triple | Of or having three parts; threefold |
| semicircle | An arc of 180 degrees; a half of a <I> circle</I> |
| triangle | A closed plane geometric figure formed by three points not in a straight line connected by three line segments |
| bicycle | A light vehicle consisting of a metal frame on which two wheels are mounted, one behind the other. |
| unify | To make into a unit |
| triplets | One of three children born at one birth |
| semicolon | A punctuation mark |
| biceps | Any muscle that has two points of attachment at one end, especially the large muscle at the front of the upper arm that bends the elbow |
| bimonthly | Once every two months |
| unity | The condition of being united into a single whole, oneness |
| trio | A group of three |
| university | A school of higher learning that offers degrees and includes programs of study in graduate school, professional schools, and regular college |
| biannual | Happening twice each year, semiannual |
| semifinals | A game or match that precedes the final, as in a tournament. |
