一も二も無く[ichimonimonaku] unhesitatingly
一言二言[hitokotofutakoto] a word or two
一石二鳥[issekinichou] killing two birds with one stone
一二に及ばず[ichininioyobazu] right away
一姫二太郎[ichihimenitarou] It's good to have a girl first and then a boy

うり二つ[urifutatsu] as alike as two melons (two peas in a pod)
黄道十二宮[koudoujuunikyuu] twelve signs of the zodiac
二度[futatabi] again
最小二乗法[saishounijouhou] least-squares method
三十二分音符[sanjuunibuonpu] 32nd note

安心立命[anshinritsumei] spiritual peace and enlightenment
遺命[imei] will
一所懸命[isshokenmei] very hard
一生けん命[isshoukenmei] very hard
一般命令演算機構[ippanmeireienzankikou] general instruction unit (computer)

一命[ichimei] (a) life
運命[unmei] fate
運命論[unmeiron] fatalism
延命[enmei] keeping alive longer
恩命[onmei] gracious command or words

１月[ichigatsu] January
ひと月[ichigetsu] one month
下弦の月[kagennotsuki] waning moon
何ヶ月[nankagetsu] how many months?
何月[nangatsu] what month

佳月[kagetsu] good month
か月[kagetsu] (number of) months
花鳥風月[kachoufuugetsu] beauties of nature
各月[kakugetsu] every month
隔月[kakugetsu] every second month

セーム革[seemugawa] chamois leather
沿革[enkaku] history
革まる[aratamaru] to be renewed
革める[aratameru] to change
改革[kaikaku] reform

改革案[kaikakuan] reform proposal
改革過程[kaikakukatei] reform process
革靴[kawagutsu] leather shoes
革新[kakushin] reform
革新系[kakushinkei] liberal