Added 10 October 2026 zoroastrianism noun Categories: Mind & IdeasRare Words noun ! Definition from WordNet 3.1, Princeton University. More about zoroastrianism at Wordnik → Where our words come from → System of religion founded in Persia in the 6th century BC by Zoroaster; set forth in the Zend-Avesta; based on concept of struggle between light (good) and dark (evil). Related Words: mazdaismzoroastrismzarathustrismmazdeismmazdayasnianismmazdayasnamazdeanmagismiranimazdakismmazdeistmagian Back to today's word