There are 26 letters in the English alphabet, consisting of 21 consonants and five vowels. The English alphabet derives from the Latin alphabet that is used in many languages around the world. Continue Reading. The English alphabet traditionally begins with the letter a and ends with the letter z..
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Computing. 1  Extensibility. 2  Filename extension, suffix to the name of a computer file, designed to show its format. 3  Software extension, a file containing programming that serves to extend the capabilities of or data available to a more basic program Extension (Mac OS), particular type of this software. Browser extension Mozilla extensions for Firefox and other Mozilla projects.