Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The fifth letter of the modern English alphabet.
  • noun Any of the speech sounds represented by the letter e.
  • noun The fifth in a series.
  • noun Something shaped like the letter E.
  • noun A grade that indicates failing status.
  • noun The third tone in the scale of C major or the fifth tone in the relative minor scale.
  • noun A key or scale in which E is the tonic.
  • noun A written or printed note representing this tone.
  • noun A string, key, or pipe tuned to the pitch of this tone.
  • noun Mathematics The base of the natural system of logarithms, having a numerical value of approximately 2.71828.
  • noun The hypothesized textual source of certain narrative portions of the Pentateuch in which God is referred to as Elohim rather than with the Tetragrammaton.
  • abbreviation electron

from The Century Dictionary.

  • A prefix of Anglo-Saxon origin, one of the forms of the original prefix ge-. It remains unfelt in enough. See i-.
  • The unpronounced termination of many English words.
  • The fifth letter and second vowel in our alphabet.
  • As a numeral, 250.
  • As a symbol: In the calendar, the fifth of the dominical letters.
  • In logic, the sign of the universal negative proposition. See A, 2.
  • In algebra: [capitalized] The operation of enlargement: thus, Efx = f (x + 1); also, the greatest integer as small as the quantity which follows: thus, . [l. c.] The base of the Napierian system of logarithms; also, the eccentricity of a conic.
  • In music: The key-note of the major key of four sharps, having the signature , or of the minor key of one sharp, having the signature ; also, the final of the Phrygian mode in medieval music.
  • In the fixed system of solmization, the third tone of the scale, called mi: hence so named by French musicians.
  • On the keyboard of the pianoforte, the white key to the right of every group of two black keys.
  • The tone given by such a key, or a tone in unison with such a tone.
  • The degree of a staff assigned to such a key or tone; with the treble clef, the lower line and upper space .
  • A note on such a degree, indicating such a key or tone .
  • As an abbreviation: East: as, E. by S., east by south. See S. E., E. S. E., etc.
  • In various phrase-abbreviations. See e. g., i. e., E. and O. E., etc.
  • A prefix of Latin origin, a reduced form of ex-, alternating with ex- before consonants, as in evade, elude, emit, etc. See ex-.
  • [capitalized] The sign of residuation (which see).
  • [capitalized] In chem., sometimes used as the symbol for erbium: more commonly Er.
  • The common symbol for the modulus of elasticity, or the force, in pounds, required to stretch a bar of any material one square inch in cross-section until its length is increased by one hundred per cent.
  • In electricity, a symbol for electromotive force.
  • An abbreviation of Earl;
  • of Eastern;
  • of English;
  • in experimental psychology, of experimenter.

from the GNU version of the Collaborative International Dictionary of English.

  • The fifth letter of the English alphabet.
  • (Mus.) E is the third tone of the model diatonic scale. E♭ (E flat) is a tone which is intermediate between D and E.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The fifth letter of the basic modern Latin alphabet.
  • noun mathematics The base of natural logarithms, a transcendental number with a value of approximately 2.718281828459
  • noun close-mid front unrounded vowel
  • noun The fifth letter of the English alphabet, called e and written in the Latin script.
  • noun The ordinal number fifth, derived from this letter of the English alphabet, called e and written in the Latin script.
  • noun The name of the Latin script letter E/e.
  • noun mathematics the base of the natural logarithm, 2.718281828459045…

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the base of the natural system of logarithms; approximately equal to 2.718282...
  • noun a fat-soluble vitamin that is essential for normal reproduction; an important antioxidant that neutralizes free radicals in the body
  • noun the 5th letter of the Roman alphabet
  • noun the cardinal compass point that is at 90 degrees

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Sense 8, from Elohim.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Modification of capital letter E, from Ancient Greek letter Ε (E, "Epsilon").

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Middle English and Old English lower case letter e and split of æ, ea, eo, and œ, from five 7th century replacements of Anglo-Saxon Futhorcs by Latin letters:

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Examples

  • But I could not utter the word, so strong on the other hand, also in the dream, was my conventional awareness: countless inhibitions made the syllables stick in my throat, until, sobbing with anguish, I reached the point where the four letters: f, r, e, e -- crossed the threshold of my consciousness.

    Archive 2010-07-01 David McDuff 2010

  • But I could not utter the word, so strong on the other hand, also in the dream, was my conventional awareness: countless inhibitions made the syllables stick in my throat, until, sobbing with anguish, I reached the point where the four letters: f, r, e, e -- crossed the threshold of my consciousness.

    Journeys David McDuff 2010

  • Crucially, this formula is not understood as ˜e is an event that contains a swim by Ewan™ or as “e is an event in which Ewan is swimming”.

    Situations in Natural Language Semantics Kratzer, Angelika 2009

  • It is simply stipulated on the basis of contextual considerations that c* and e* are intended to act as contrasts to c and e.

    My Shasta Daisy 2009

  • (The immediate structure of an expression is the syntactic mode its immediate constituents are combined. e is an immediate constituent of e² iff e is a constituent of e² and e² has no constituent of which e is a constituent.) (Clocal)

    Compositionality Szabó, Zoltán Gendler 2007

  • On this view causal relations have the form: c causes e rather than e*.

    The Metaphysics of Causation Schaffer, Jonathan 2007

  • Let us say that the expressions e and e² are n-global equivalents just in case for some natural number k there is a k-ary F in

    Compositionality Szabó, Zoltán Gendler 2007

  • Let us say that the expressions e and e² are local equivalents just in case they are the results of applying the same syntactic operation to lists of expressions such that corresponding members of the lists are synonymous.

    Compositionality Szabó, Zoltán Gendler 2007

  • “Look what ‘e done to ’is own daughter, ‘oo nursed ’im like a saint with one foot in ‘eaven through all the years ’e was ill,” someone else observed.

    Slightly Married Balogh, Mary 2003

  • The upper ends of the hooks have fingers, _d d'_, which holds the shuttle in position as long as the action of the springs, _e e'_, continues.

    Scientific American Supplement, No. 286, June 25, 1881 Various

Comments

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  • Symbol for the mathematical, transcendental number 2.718281828459045... Illustration: if you should invest $1.00 in a bank that paid interest compounded, not daily, or monthly, but EVERY INSTANT, at the end of a year you'd have $271.18. Cool, no? "e" is related to organic growth and radioactive decay et al.

    December 4, 2006

  • The derivative of e is 1, the derivative of e^x is e^x. Furthermore, the integral of 1/x is the (log base e)ln(x).

    December 5, 2006

  • Plus, of course,

    e ^ (i * π) = -1

    December 5, 2006

  • I like this even better:

    e^(i*π) + 1 = 0

    All of the most mysterious symbols of mathematics combined in one equation.

    See Euler's identity.

    December 5, 2006

  • hmmm...the derivative (with respect to x) of e is 0, not 1.

    March 21, 2007

  • Agreed. e is a constant, and so differentiation gives zero.

    March 21, 2007

  • The end of time and the beginning of eternity.

    September 11, 2008

  • e (Vietnamese): to fear.

    October 20, 2009

  • For its use in the mnemonic words of logic, see a.

    February 14, 2013