Vegetarianism (noun)

1. The practice of abstaining from the consumption of meat and fish, and sometimes other animal products, for ethical, health, or environmental reasons.
2. A diet that is primarily plant-based, and may or may not include dairy, eggs and other animal products.

Origin:

From the latin word "vegetus" meaning "fresh, lively" and the suffix "-arianism" meaning "a system of beliefs".

Examples:

1. He adopted vegetarianism for health reasons.
2. She decided to become a vegetarian to reduce her carbon footprint.
3. Many people become vegetarians for ethical reasons related to the treatment of animals.
4. Vegetarianism is becoming more popular as people become more conscious of their health and the environment.
5. The restaurant offers a variety of vegetarian options for those who follow a plant-based diet.