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Iranian academy of Persian language and literature
The term Saosiiant has a wide range of meaning in the Gath as, wherein it can refer to any great man who, treading on the path of righteousness and
following the teachings of zarathushtra, takes over the leadership of the Mazda-worshipping community and brings in peace and tranquility.
The meaning of this term is gradually narrowed down in the Later Avesta in such a way that in the end it is converted into an attribute of the Final
Saviour- the victorious "Astuuat . arata" - Who according to Zoroastrian, beliefs is born from the seed of Zarathushtra three thousand years after him,
and holding the powerful dub of the ancient heroes in his hand, defeats the devils and the fiends and brings about the renovation of the world.