一元[ichigen] unitary
一元化[ichigenka] unification
一元的[ichigenteki] monistic
一元論[ichigenron] monism
一次元[ichijigen] one dimensional

一新紀元[isshinkigen] new era
隠元[ingen] beans
隠元豆[ingenmame] common bean (Phaseolus vulgaris)
家元[iemoto] head of a school (of music, dance)
火の元[hinomoto] origin of fire

其の後[sonoato] after that
已後[igo] after this
一死後[isshigo] after one out (in Baseball)
気後れ[kiokure] nervous
紀元後[kigengo] post-era

空前絶後[kuuzenzetsugo] (so marvelous or horrible that it may be) the first and probably the last
兄後[anigo] elder brother
月後れ[tsukiokure] a month or older
午後[gogo] afternoon
午後中[gogojuu] throughout the afternoon

ジュラ紀[juraki] Jurassic Period
一新紀元[isshinkigen] new era
一世紀[isseiki] century
紀伊國屋[kinokuniya] Kinokuniya
紀元[kigen] era

紀元後[kigengo] post-era
紀元前[kigenzen] pre-era
紀行[kikou] traveller's journal
紀行文[kikoubun] traveller's journal
紀要[kiyou] bulletin