Definition of Vegan

Ok guys there are many misconception about being vegan! I have many vegan friends and they have different theories. I want to know here the most authentic definition of VEGAN

Vegan (vee-gun) 1. One who does not eat animals or animal by-products, wear items made of animal skins or use any products that contain animal ingredients or that were tested on animals. 2. Does not support industries that exploit animals. 3. Does not profit or benefit from cruelty to animals.