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

グレゴリオ暦[guregorioreki] Gregorian calendar
陰暦[inreki] lunar calendar
花暦[hanagoyomi] flower calendar
改暦[kaireki] calendar revision (e.g. at start of year)
還暦[kanreki] 60th birthday

旧暦[kyuureki] Japan's old (lunisolar) calendar
西暦[seireki] Christian Era
太陽暦[taiyoureki] solar calendar
剥がし暦[hagashigoyomi] calendar pad
盲暦[mekuragoyomi] picture calendar for illiterates

一段[ichidan] more
一段動詞[ichidandoushi] ichidan verb (one of the two main conjugation classes of verbs in modern Japanese, usually ending in -eru or -iru)
一段落[ichidanraku] completing the first stage
階段[kaidan] stairs
格段[kakudan] special

計画段階[keikakudankai] planning stage
決済手段[kessaishudan] method of payment
減段[gentan] reduction (of crop size)
五段[godan] Japanese verb group
五段動詞[godandoushi] godan verb (one of the two main conjugation classes of verbs in modern Japanese, usually ending in -u, -ku, -su, -tsu, -gu, -bu, -mu, etc.)