建けん治じけんじMeanings1nounKenji era (1275.4.25-1278.2.29)A Japanese era name (年号) from the Kamakura period. Used in historical contexts.建けん治じ元がん年ねんは西せい暦れき1275年ねんにあたる。The first year of the Kenji era corresponds to 1275 CE.