Definition
	base: 1)In exponential notation, the number or variable that is multiplied repeatedly. 2)In a triangle or polygon, the side or face of the figure used to measure it. 3) In numbering systems the number of unique numerals used. For example base ten uses the numerals 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. Base 2 only uses 0s, and 1s.

 

	Sentence: 5 is the base in the expression 53.