Meaning: こうあんn. (Kanji=公安) public safety, public welfare, benefit of the public, good of the general populationn. (Kanji=公案) Zen question for meditationn. (Kanji=考案) plan, program, scheme; device; idean. (Kanji=弘安) Koan, Japanese era name that extended from 1278 to 1288n. (Kanji=康安) Koan, Japanese era name that extended from 1361 to 1362v. (Kanji=考案する) design, invent, create, originate