A person fanatically committed to an idea or cause is known as what?

The term "zelot" refers to a person who is fanatically devoted to a cause or ideology. This aligns perfectly with the essence of the question, which seeks to describe individuals who possess an intense, unwavering commitment to their beliefs or causes. Historically, the term traces back to a political movement in which individuals displayed extreme zeal in their pursuits, making it synonymous with extreme passion or fervor for a particular idea or cause.

Understanding this term in the context of dedication to a particular belief system helps to clarify its significance and enhances one's vocabulary when describing individuals with similar characteristics. The other options, while they may represent strong emotions or actions, do not specifically embody the idea of fanatical commitment to a cause.