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

アドレス帳[adoresuchou] address book
画帳[gachou] picture album
勧進帳[kanjinchou] temple solicitation book
記帳[kichou] registry
元帳[motochou] ledger

雑記帳[zakkichou] notebook
参賀帳[sangachou] congratulatory visitor's book
仕訳帳[shiwakechou] book-keeping journal
氏子帳[ujikochou] shrine visitors' register
写真帳[shashinchou] photograph album