Definition from Wiktionary, the free dictionary
- Zoroastrism (dated)
- General usage: Religion and philosophy based on the teachings ascribed to the prophet Zoroaster.
- Scholastic usage: identifies the religion as it exists today, as distinguished from earlier forms of the religion. (see Related terms, below).
- Zarathustrianism, a term coined by Hermann Lommel (and popularized by Ilya Gershevitch) to denote the prophet's own doctrine as distinguished from later accretions. From Zarathustra, Avestan language name of Zoroaster. Similarly,
- Zarathustricism: distinguishes the teachings of Younger Avestan texts from Zarathustrianism and also from later accretions
religion and philosophy ascribed to Zoroaster