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

黄道十二宮[koudoujuunikyuu] twelve signs of the zodiac
丸十[marujuu] cross in a circle
五十音[gojuuon] the Japanese syllabary
五十音順[gojuuonjun] the syllabary order
五十三次[gojuusantsugi] the 53 Toukaidou stages

五十年祭[gojuunensai] jubilee
五十歩百歩[gojuppohyappo] six of one and a half dozen of the other
五十路[isoji] age fifty
三十戸[sanjikko] thirty houses
三十三所[sanjuusansho] any of a number of sets of thirty-three holy places enshrining Avalokitesvara (esp. those comprising a popular pilgrimage in the Kinki region)

将又[hatamata] and
一将[isshou] general (military)
王将[oushou] king
餓鬼大将[gakidaishou] boss of the children (in the neighbourhood) (neighborhood)
海将[kaishou] Vice-Admiral (Maritime Self-Defence Force of Japan) (defense)

近い将来[chikaishourai] near future
金将[kinshou] gold general (shogi)
空軍連絡将校[kuugunrenrakushoukou] air liaison officer
軍将[gunshou] army commander
次将[jishou] second in command

御神酒[omiki] sacred wine or sake
ギリシア神話[girishiashinwa] Greek mythology
悪神[akujin] evil god
圧神[asshin] pressure sensation
安神[anshin] relief

伊勢大神宮[isedaijinguu] the Grand Shrines of Ise
一神教[isshinkyou] monotheism
一神論[isshinron] monotheism
運動神経[undoushinkei] motor nerves
疫病神[yakubyougami] jinx (lit: god of pestilence)