異境[ikyou] foreign country
越境[ekkyou] border transgression
佳境[kakyou] climax (story)
環境[kankyou] environment
環境グループ[kankyouguruupu] environmental group

環境事業[kankyoujigyou] environmental business
環境庁[kankyouchou] Environment Agency
環境庁長官[kankyouchouchoukan] Director General of Environment Agency
環境配慮書[kankyouhairyosho] environmental impact statement
環境変化[kankyouhenka] environmental change

安全期[anzenki] safe period
暗黒期[ankokuki] eclipse period
一期[ichigo] one's life time
一期[ikki] one term
一期一会[ichigoichie] once-in-a-lifetime encounter (hence should be cherished as such)

一周期[isshuuki] period (in astronomy)
一定期間[itteikikan] fixed interval
延期[enki] postponement
延期になる[enkininaru] to be postponed
沖積期[chuusekiki] alluvial period

圧着端子[acchakutanshi] crimp contact
異端[itan] heresy
異端者[itansha] heretic
井戸端[idobata] side of well
井戸端会議[idobatakaigi] content-free chat

一端[ittan] one end
一端[ippashi] competent enough
下っ端[shitappa] underling
下端[katan] lower end
管端[kantan] end of wind instrument