1 
mono 
monologue 
A long speech or performance given by one person. 


monorail 
A railroad track that has only one rail. 

1 
uni 
unicorn 
An imaginary animal that has one horn. 


unicycle 
A pedaled vehicle that has one wheel. 

2 
bi 
bicycle 
A pedaled vehicle that has two wheels. 


biennial 
An event that occurs every two years. 

2 
du 
duet 
A piece of music written for two singers or musical instruments. 


duplex 
A house divided into two units with separate entrances. 

3 
tri 
triangle 
A plane figure that has three angles and three sides. 


tricycle 
A pedaled vehicle that has three wheels. 

4 
quad 
quadrangle 
A plane figure that has four angles and four sides. 


quadruple 
A number or amount four times as great as another. 

5 
penta 
pentagon 
A plane figure that has five angles and five sides. 


pentathlon 
An athletic contest that consists of five events. 

5 
quint 
quintet 
A group of five persons or things. 


quintuplets 
Five children born at the same time to the same mother. 

6 
hexa 
hexagon 
A plane figure that has six angles and six sides. 


hexagram 
A sixpointed star. 

7 
sept 
