constancy

製紙工場: paper mill, paper factory / 製糸工場: filature, yarn-making factory

(slang) covert studying / practice

practice, train, drill / polish, gloss / refine

口実:: excuse

公人: public character / 後人: posterity; future generations / 工人: workman; laborer; craftsman; artisan

koji: a substance that is produced by letting a mold, especially Aspergillus oryzae, grow on rice, barley, soybeans, etc., used to make fermented products such as sake, amazake, miso, and soy sauce

a surname

光二, 光仁, 光司, 光次, 光治, 公二, 剛治, 好治: a male given name / 孝志, 孝次, 孝治, 宏次, 幸二, 幸司, 幸治, 康司: a male given name / 廣二, 晃二, 晃司, 晃次, 浩二, 浩司, 浩嗣, 浩次: a male given name

公二郎, 厚治郎, 光治郎: a male given name