The book provides explanations for some of the words and terms of the Kitáb-i-Iqan, one of the most important books revealed by Bahá'u'lláh. Its contents were gleaned and translated from "Qamus-i-Iqan" (Dictionary of Iqan) by Mr. Ishraq Khavari and other sources. It is a valuable aid to understanding the Kitáb-i-Iqan.