御世辞[oseji] flattery
御世話になる[osewaninaru] to receive favor (favour)
一世紀[isseiki] century
永世[eisei] eternity
永世中立[eiseichuuritsu] permanent neutrality

永世中立国[eiseichuuritsukoku] permanent neutral country
厭世[ensei] pessimism
厭世家[enseika] pessimist
厭世観[enseikan] pessimistic view of life
厭世主義[enseishugi] pessimism

御中[onaka] stomach
御話中[ohanashichuu] busy (phone)
アル中[aruchuu] alcoholism
π中間子[paichuukanshi] pi meson
暗中[anchuu] in the dark

暗中摸索[anchuumosaku] groping in the dark
意中[ichuu] one's mind
意中の女[ichuunoonna] sweetheart
井の中の蛙大海を知らず[inonakanokawazutaikaiwoshirazu] parochial
一日中[ichinichijuu] all day long

医界[ikai] medical world
医学界[igakukai] medical world
黄金世界[ougonsekai] utopia
下界[gekai] this world
花柳界[karyuukai] red-light district

界隈[kaiwai] neighborhood
界面[kaimen] interface
各界[kakkai] each field
学界[gakkai] academic or scientific world
官界[kankai] bureaucracy