From Avestan Jašan (yasna) or jašn “general term for a celebratory act of communal worship that is observed at festivals as well as at special family occasions, including the birth of a child, or moving into a new home”
1) a prefix meaning not. It's used to give opposite and negative meanings to adjectives, adverbs and nouns.
2) without, less, none, lack of
3) not any, by no amount, not at all