e

/i:/ plural E's, e's noun (C) the fifth letter of the English alphabet E 1 noun

a) the third note in the musical scale 1 (8) of C major

b) the musical key 2 (4) based on this note

2

1 the written abbreviation of east or eastern

2 BrE technical the written abbreviation of earth, a connection between a piece of electrical equipment and the ground

3 slang the abbreviation of ecstasy (2), an illegal drug

4 short for E number

5 a very low mark for an exam or piece of school work