Real Dictionary

E
E or e is an abbreviation for words beginning with e, such as 'English', 'east', and ' eastern'.
variable noun: E is the drug ecstasy, or a tablet of ecstasy.
variable noun: E is the fifth letter of the English alphabet.
variable noun: In music, E is the third note in the scale of C major.

E in American English
noun: the fifth letter of the English alphabet, a vowel

E in American English 1
a grade indicating below-average work, often equivalent to condition
the fifth letter of the English alphabet: from the Greek epsilon, a borrowing from the Phoenician
abbreviation: east
abbreviation: electron

E in American English 2
Earl
the number used as the base of the system of natural logarithms, approximately 2.71828
symbol: a transcendental constant equal to 2.7182818…, used as the base of natural logarithms; the limit of the expression (1+1/n)nas n approaches infinity
symbol: the fifth in order or in a series

e in American English 3
electron

e in British English
noun: the fifth letter and second vowel of the modern English alphabet
symbol for: 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: eπi = –1, where i = √–1
symbol for: earth

e-
prefix: e- is used to form words that indicate that something happens on or uses the internet. e- is an abbreviation for 'electronic'.

E- in American English
done, made, purchased, etc. electronically, over the Internet
ex-1
prefix

E- in British English
prefix: used with numbers indicating a standardized system within the European Union, as of recognized food additives or standard pack sizes

e- in British English 1
prefix forming verbs and verbal derivatives: out

e- in British English 2
prefix: electronic, indicating the involvement of the internet

e. in American English
abbreviation: Earl
abbreviation: eldest

E. in British English
abbreviation for: Earl