* It's a shortened name: "A.S." could stand for something like "Abhishek" or "Arun" and be part of his full name.
* It's a nickname or alias: The name might be a shortened version of a longer, more formal name used in professional or personal settings.
* It's a title or designation: "A.S." could be an abbreviation for a title like "Assistant Secretary," "Associate Scientist," or something else related to his profession.
To find the full form, you would need more context about who A.S. Dileep Kumar is and where you encountered this name.