circumference vs middle

circumference

• The line that bounds a circle or other two-dimensional figure 

• The length of such a line 

• The length of the longest cycle of a graph 

middle

• A centre, midpoint. 

• The part between the beginning and the end. 

• The middle stump. 

• The central part of a human body; the waist. 

• The middle voice. 

• Pertaining to the middle voice. 

• Located in the middle; in between. 

• Central.