| A | B |
|---|
| unicellular | having only one cell |
| unicorn | a horse-like fabled animal that has one horn growing out of the middle of its forehead |
| unicycle | a one-wheeled vehicle on which the rider sits and pedals |
| unidirectional | moving in only one direction |
| unify | to join together into one group |
| unilateral | one-sided |
| unique | one of a kind; unusual or rare |
| unison | saying the same words or sounds at the same time; a group that sounds like one |
| unit | one group |
| unitard | a one-piece leotard and tights combination |
