e -- from Wolfram MathWorld. The constant e is base of the natural logarithm. e is sometimes known as Napier's constant, although its symbol (e) honors Euler. e is the unique number with the property that the area of the region bounded by the hyperbola y=1/x, the x-axis, and the vertical lines x=1 and x=e is 1. CM1Qq4B63SJH The number e, also known as Euler's number, is a mathematical constant approximately equal to 2.71828 that can be characterized in many ways. It is the base of the natural logarithms. It is the limit of (1 + 1/n)n as n approaches infinity, an expression that arises in 7CaeC9Sn9LaG noun, plural E's or Es, e's or es. the fifth letter of the English alphabet, a vowel. any spoken sound represented by the letter E or e, as in met, meet, mere, etc. something having the shape of an E. Jas98ezYdrZ1
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