Kittaneh, Omar2023-03-122023-03-1220210361-0926https://doi.org/10.1080/03610926.2020.1742356http://hdl.handle.net/20.500.14131/580This paper introduces two more definitions of the conditional average entropy. Some properties of the three definitions are studied and some mistakes in the preceding literature are corrected.Shannon entropy, Renyi entropy, average entropy, conditional entropies, relative entropyMTH