Note that it is common to pronounce the term as "hyakusei," which is a mixture of the Han reading of Chinese characters and the Wu reading, in the case of a Japanese reading of a Chinese passage or a use in ancient Japanese that is used in the original meaning, or "hyakusho," which is the Wu reading, in a case of a use in Japanese in or after the medieval period.
なお、本来の意味で用いる漢文の読み下し及び日本の古代の用例には漢音と呉音の混交した"ひゃくせい"、日本の中世以降の用例には呉音の"ひゃくしょう"の読みを当てるのが慣例である。