e  
—symbol for  
1.  maths a transcendental number, fundamental to mathematics, that is the limit of (1 + 1/n)^{n} as n increases to infinity: used as the base of natural logarithms. Approximate value: 2.718 282…; relation to π: e^{πi} = 1, where i = √1 
2.  electron 
3.  chess See algebraic notation 
E  
—symbol for  
—abbreviation for  
1.  earth 
2.  East 
3.  English 
4.  Egypt(ian) 
5.  exa 
6.  music 
a. a note having a frequency of 329.63 hertz (E above middle C) or this value multiplied or divided by any power of 2; the third note of the scale of C major  
b. a key, string, or pipe producing this note  
c. the major or minor key having this note as its tonic  
7.  physics 
a. energy  
b. electric field strength  
c. electromotive force  
d. Young's modulus (of elasticity)  
8.  logic A I Compare O a universal negative categorical proposition, such as no pigs can fly: often symbolized as SeP 
9.  a. a person without a regular income, or who is dependent on the state on a longterm basis because of unemployment, sickness, old age, etc 
b. See also occupation groupings (as modifier): E worker  
10.  Spain (international car registration) 
11.  informal the drug ecstasy 
[(for sense 10) from Spanish España] 
E.  
—abbreviation for  
Earl 
e^{1}  
—prefix forming verbs and verbal derivatives  
1.  out: eviscerate; egest 
2.  away: elapse; elongate 
3.  outside: evaginate 
4.  completely: evaporate 
5.  without: ebracteate 
[from Latin ē away; related to 
e^{2}  
—prefix  
electronic, indicating the involvement of the internet: ebusiness; emoney 
E  
—prefix  
See also E number used with numbers indicating a standardized system within the European Union, as of recognized food additives or standard pack sizes 
e abbr.
electron
e (ē) Pronunciation Key
An irrational number, with a numerical value of 2.718281828459.... It is mathematically defined as the limit of (1 + ^{1}/_{n} )^{n} as n grows infinitely large. It is the base of natural logarithms and has many applications in mathematics, especially in expressions involving exponential growth and decay. 
E

A prefix that stands for “electronic” and refers to information technologies, business, and almost anything connected to or transmitted over the Internet. Some examples of its use include ebusiness, ecommerce, ebook, and email.
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e.

e electronic 
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E.
