Entry 1 sense Webster, 1913 Avesta · A·ves·ta · IPA /əˈvɛstə/ 01 n. The Zoroastrian scriptures; the sacred text of Zoroastrianism. See Zend-Avesta. 1. The Zoroastrian scriptures; the sacred text of Zoroastrianism. See Zend-Avesta. See: Zend-Avesta