e-pref. Electronic: e-cash; e-cigarette; e-tickets; e-waste.[e(lectronic), on the model of e-mail.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.e- 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 ? away; related to ex-1]e- prefix (Electronics) electronic, indicating the involvement of the internet: e-business; e-money. E- prefix (Cookery) used with numbers indicating a standardized system within the European Union, as of recognized food additives or standard pack sizes. See also E number Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014E, e (i) n., pl. or E’s, es e’s. 1. the fifth letter of the English alphabet, a vowel. 2. any spoken sound represented by this letter. 3. something having the shape of an E. 4. a written or printed representation of the letter E or e. E 1. east. 2. eastern. 3. English. 4. excellent. 5. Expressway. E Symbol. 1. the fifth in order or in a series. 2. (sometimes l.c.) (in some grading systems) a grade or mark indicating that a student’s work is in need of improvement in order to be passing. 3. a. the third note of the ascending C major scale. b. a tonality having E as the tonic. 4. energy. 5. Biochem. glutamic acid. e Math. Symbol. 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. e- or E-, (used in combination) 1. electronic: e-mail; E-text. 2. online: e-banking. e- var. of ex- 1 , occurring in words of Latin origin before consonants other than c, f, p, q, s, and t: emit. E. 1. Earl. 2. Earth. 3. east. 4. Easter. 5. eastern. 6. engineer. 7. engineering. 8. English. e. 1. eldest. 2. Football. end. 3. engineer. 4. engineering. 5. entrance. 6. Baseball. error. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.