Ignorance == 无明 Sanskrit word is Avidya. Literally, it means darkness without illumination. Actually it refers to illusion without englightenment, i.e., the illusory phenomena for realities. Avidya is the first or the last of the Twelve Nidanas. Ignorance, karma and desire are the three forces that cause reincarnation.

ID: 162 Origin: [英汉对照词典]