2. SPELLING uni- = one

3. unicellular  adjective  Having only one cell  The organism has only one cell which makes it unicellular.

4. unicorn  Noun  A horse-like fabled animal that has one horn growing out of the middle of its forehead  The unicorn had one horn and looked like a horse.

5. unicycle  Noun  A one-wheeled vehicle on which the rider sits and pedals  The clown rode the unicycle, the one-wheeled vehicle.

6. unidirectional  adjective  Moving in only one direction  A one-way street would be unidirectional.

7. unify  Verb  To join together into one group  The thirteen colonies decided to unify when they became the United States of America.

8. unilateral  adjective  One sided  A discussion where only one person talks is a unilateral discussion.

9. unique  Adjective  One of a kind; unusual or rare  There is only one of you, you are unique.

10. unit  Noun  One group  I will put you together in one group and you will be a unit.

11. unison  noun  An instance of saying the same words or sounds at the same time; a group that sounds like one  A group of people often say “The Pledge of Allegiance” in unison, as one group.

12. unitard  noun  A one-piece leotard and tights combination  The unitard or one-piece outfit is often worn by dancers.