A transliteration of the Sanskrit avaivartika, which means "non-backsliding." The mind firm in its intent on the attainment of enlightenment that does not fall back again into mistaken habits. This is one of the marks of the attainment of bodhisattvahood, as distinguished from worldlings and practitioners of the two vehicles. Also written as 阿毘跋致 and 阿惟越致.

華譯為不退轉，是菩薩的階位名，要經過一大阿僧祇劫的修行，才能到達此位。

陳義孝編, 竺摩法師鑑定, 《佛學常見辭彙》

avaivartika, avivartin, aparivartya, 不退轉 One who never recedes; a Bodhisattva who, in his progress towards Buddhahood, never retrogrades to a lower state than that to which he has attained. Also 阿毘跋致; 阿惟越致.

A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous