noun, plural E’s or Es, e’s or es.

  1. the fifth letter of the English alphabet, a vowel.
  2. any spoken sound represented by the letter E or e, as in met, meet, mere, etc.
  3. something having the shape of an E.
  4. a written or printed representation of the letter E or e.
  5. a device, as a printer’s type, for reproducing the letter E or e.

  1. electron.
  2. Physics. elementary charge.


  1. Mathematics. a transcendental constant equal to 2.7182818 …, used as the base of natural logarithms; the limit of the expression (1+1/n)n as n approaches infinity.
  2. Logic. universal negative.

  1. east.
  2. eastern.
  3. English.
  4. excellent.
  5. Expressway.


  1. the fifth in order or in a series.
  2. (sometimes lowercase) (in some grading systems) a grade or mark, as in school or college, indicating the quality of a student’s work is in need of improvement in order to be passing.
  3. Music.
    1. the third tone in the scale of C major or the fifth tone in the relative minor scale, A minor.
    2. a string, key, or pipe tuned to this tone.
    3. a written or printed note representing this tone.
    4. (in the fixed system of solmization) the third tone of the scale of C major, called mi.
    5. the tonality having E as the tonic note.
  4. (sometimes lowercase) the medieval Roman numeral for 250.Compare Roman numerals.
  5. Physics, Electricity.
    1. electric field.
    2. electric field strength.
  6. Physics. energy.
  7. Biochemistry. glutamic acid.
  8. Logic. universal negative.
  9. a proportional shoe width size narrower than EE and wider than D.

  1. variant of ex-1 occurring in words of Latin origin before consonants other than c, f, p, q, s, and t:: emit.

(used in combination)

  1. electronic: e-book; e-cigarette.
  2. on the Internet; online: e-content; e-commerce.
  3. involving electronic data transfer, especially over the Internet: e-banking.

  1. eldest.
  2. Football. end.
  3. engineer.
  4. engineering.
  5. entrance.
  6. Baseball. error; errors.

  1. Earl.
  2. Earth.
  3. east.
  4. Easter.
  5. eastern.
  6. engineer.
  7. engineering.
  8. English.


  1. Edward (St. John),1925–2000, U.S. writer and illustrator.


  1. AlecAlexander Raban, 1898–1981, English novelist, traveler, and lecturer (son of Arthur, brother of Evelyn).
  2. Arthur,1866–1943, English literary critic, publisher, and editor (father of Alec and Evelyn).
  3. Evelyn (Arthur St. John),1903–66, English novelist, satirist, biographer, and author of books on travel (son of Arthur, brother of Alec).
  4. Frederick Judd,1861–1940, U.S. painter and illustrator.


  1. the fifth letter of the Greek alphabet (E, ε).
  2. the consonant sound represented by this letter.
  3. Mathematics. an arbitrarily small quantity, used to indicate that a given quantity is small, or close to zero.

noun plural e’s, E’s or Es

  1. the fifth letter and second vowel of the modern English alphabet
  2. any of several speech sounds represented by this letter, in English as in he, bet, or below

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

symbol for

  1. earth
  2. East
  3. English
  4. Egypt(ian)
  5. exa-
  6. music
    1. 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
    2. a key, string, or pipe producing this note
    3. the major or minor key having this note as its tonic
  7. physics
    1. energy
    2. electric field strength
    3. electromotive force
    4. Young’s modulus (of elasticity)
  8. logic a universal negative categorical proposition, such as no pigs can fly: often symbolized as SePCompare A, I 2, O 1
    1. a person without a regular income, or who is dependent on the state on a long-term basis because of unemployment, sickness, old age, etc
    2. (as modifier)E worker See also occupation groupings

abbreviation for

  1. Spain (international car registration)
  2. informal the drug ecstasy

prefix forming verbs and verbal derivatives

  1. outeviscerate; egest
  2. awayelapse; elongate
  3. outsideevaginate
  4. completelyevaporate
  5. withoutebracteate


  1. electronic, indicating the involvement of the internete-business; e-money


  1. used with numbers indicating a standardized system within the European Union, as of recognized food additives or standard pack sizesSee also E number

abbreviation for

  1. Earl


  1. the fifth letter of the Greek alphabet (Ε, ε), a short vowel, transliterated as e


  1. (foll by the genitive case of a specified constellation) the fifth brightest star in a constellationEpsilon Aurigae


  1. Edward St John . 1925–2000, US illustrator and author, noted for his bizarre humour in such works as The Unstrung Harp (1953) and The Wuggly Ump (1963)


  1. Evelyn (Arthur St John) (ˈiːvlɪn). 1903–66, English novelist. His early satirical novels include Decline and Fall (1928), Vile Bodies (1930), A Handful of Dust (1934), and Scoop (1938). His later novels include the more sombre Brideshead Revisited (1945) and the trilogy of World War II Men at Arms (1952), Officers and Gentlemen (1955), and Unconditional Surrender (1961)
  2. Mark (Edward). born 1965, Australian cricketer: a batsman, he scored 8029 runs in 128 test matches (1991–2002)
  3. his twin brother Steve, full name Stephen Roger Waugh. born 1965, Australian cricketer: a batsman, he scored 10,927 runs in 168 test matches and captained Australia to victory in the 1999 World Cup

from Greek, literally e psilon “bare -e-, -e- and nothing else,” in contradistinction to the diphthong -ai-, which has the same sound. Greek psilon “smooth, simple” is of uncertain origin.


  1. electron


  1. The fifth letter of the Greek alphabet.
  2. The fifth in a series.


  1. Of or relating to the fifth member of a particular ordered set.
  2. Relating to or characterizing a polypeptide chain that is one of five types of heavy chains present in immunoglobins.

  1. An irrational number, with a numerical value of 2.718281828459…. It is mathematically defined as the limit of (1 + 1n)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.

  1. The symbol for energy.
  2. The symbol for modulus of elasticity.

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 e-business, e-commerce, e-book, and e-mail.

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