Question

al·pha·bet·i·cal
 /ˌælfəˈbɛtıkəl/ ( also   al·pha·bet·ic) /ˌælfəˈbɛtık/  adj  
  : arranged in the order of the letters of the alphabet
   an alphabetical list
   The words in the dictionary are listed/shown in alphabetical order.
  al·pha·bet·i·cal·ly /ˌælfəˈbɛtıkli/  adv  
   The students are listed alphabetically by last name.