ちょっと一杯[chottoippai] let's have a quick drink
ばつ一[batsuichi] being once divorced
一向[hitaburu] nothing but
サラダ一皿[saradahitosara] plate of salad

安全第一[anzendaiichi] safety first
一か八か[ichikabachika] sink or swim
一っ走り[hitoppashiri] spin (as in 'take a car for a spin')
一つ一つ[hitotsuhitotsu] one-by-one

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

いい年をして[iitoshiwoshite] (in spite of) being old enough to know better
亥年[idoshi] year of the boar
一箇年[ikkanen] one year
一周年[isshuunen] one full year
一年以内に[ichineninaini] within a year

一年間[ichinenkan] (period of) one year
一年生[ichinensei] annual (plant)
一年草[ichinensou] annual (plant)
一年ぢゅう[ichinenjuu] all year round
一両年[ichiryounen] (a) year or two

一旦[ittan] once
元旦[gantan] New Year's Day
旦那[danna] master (of a house, shop, etc.)
巴旦杏[hatankyou] plum
文旦[buntan] shaddock

旦つく[dantsuku] husband
命旦夕に迫る[meitansekinisemaru] to be on the brink of death
旦夕[tanseki] on the brink of
若旦那[wakadanna] young master
大旦那[oodanna] master

アナログ計算機[anarogukeisanki] analog computer
コンピューター援用設計[konpyuutaaenyousekkei] computer-aided design
圧力計[atsuryokukei] manometer
移行計画[ikoukeikaku] transition plan
一計[ikkei] plan

一般会計[ippankaikei] general accounting and finance
雨量計[uryoukei] rain gauge
温度計[ondokei] thermometer
家計[kakei] household economy
家計簿[kakeibo] household account book