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

古往今来[kooukonrai] in all ages
古今[kokon] ancient and modern times
古今東西[kokontouzai] all times and places
古今無類[kokonmurui] best ever

今か今か[imakaimaka] eagerly waiting
今が今[imagaima] just now
今が今まで[imagaimamade] till just now
今しがた[imashigata] moment ago

一週[isshuu] one week
一週間[isshuukan] one week
今週[konshuu] this week
今週中に[konshuujuuni] before the week is out
さ来週[saraishuu] week after next

七週の祭[nanamawarinoiwai] the Feast of Weeks
七週の祭り[nanashuunomatsuri] the Feast of Weeks
週刊[shuukan] published weekly
週刊雑誌[shuukanzasshi] weekly magazine