e or E 
/ˈi:/ noun
plural e's or es or E's or Es /ˈi:/ noun 1 : the fifth letter of the English alphabet [count] ▪ a word that begins with an e [noncount] ▪ a word that begins with e 2 : the musical note or key referred to by the letter E : the third tone of a C-major scale [count] ▪ play/sing an E [noncount] ▪ a song in the key of E
an E for effort — see effort
