弘こう安あんこうあんFreq.FrequencyTop 100,000Meanings1nounKōan era (1278.2.29–1288.4.28)A Japanese era name (年号) from the late Kamakura period. Used in historical contexts.弘こう安あんの役えきは1281年ねんに起おこった。The Kōan Campaign occurred in 1281.