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

横座標[ouzahyou] abscissa
音標文字[onpyoumoji] phonetic symbols
確率標本[kakuritsuhyouhon] random sample
極座標[kyokuzahyou] polar coordinates
元標[genpyou] zero milestone

座標系[zahyoukei] coordinate system
座標軸[zahyoujiku] coordinate axis
座標変換[zahyouhenkan] coordinate transformation
指標[shihyou] index