A is for alphabetic.
There are many ways to organize things: alphabetic, numeric, alphanumeric, chronological, or by priority or importance.
To alphabetise means to put a list of things into alphabetic or alphanumeric order, letter-by-letter or word-by-word. Computers alphabetise lists automatically, placing special characters first, then numbers, then letter-by-letter. Computers may have a “stop list” of little words that don’t count, e.g., a, an, the, to. Dictionaries and phone books usually place special characters and numbers within the alphabet as if they were spelled out.
Letter by letter
Aida Coffee House, Aidan’s Gluten Free, Aidas Network, Aid to Women
Word by word
Aid to Women, Aida Coffee House, Aidan’s Gluten Free, Aidas Network