| A | B |
|---|
| Unicellular | having only one cell |
| Unicorn | a fabled animal that has one horn |
| Unicycle | a one wheeled vehicle |
| 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 | a group that sounds like one |
| Unit | one group |
| Unitard | a one pieces leotard and tights combination |
