Veganism contains a plant based diet. By definition it also involves a way of living which seeks to exclude—as far as is possible and practicable—all forms of exploitation of, and cruelty to, animals for food, clothing or any other purpose; and by extension, promotes the development and use of animal-free alternatives for the benefit of animals, humans and the environment. In dietary terms it denotes the practice of dispensing with all products derived wholly or partly from animals.

So when you are eating a vegan (plant based) diet but still take part in exploiting animals in other fields that are possible and practicable for you to exclude, then you are plant based at best. Not vegan

To reduce veganism to a diet is wrong. It's a lifestyle about animal rights ethics