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

テレビ局[terebikyoku] television station
医局[ikyoku] medical office
一局[ikkyoku] one game (checkers, etc.)
一局部[ichikyokubu] one part
衛星地球局[eiseichikyuukyoku] (satellite) earth station

開局[kaikyoku] opening of post-office or telephone exchange
外局[gaikyoku] external bureau
管理局[kanrikyoku] administration bureau
危局[kikyoku] crisis
共産党政治局[kyousantouseijikyoku] Politburo

ゼロ次[zeroji] zero-order
位次[iji] order of rank
一次[ichiji] first
一次記憶[ichijikioku] first memory
一次元[ichijigen] one dimensional

一次線輪[ichijisenrin] primary coil
一次電流[ichijidenryuu] primary current
月次[tsukinami] every month
五十三次[gojuusantsugi] the 53 Toukaidou stages
高次[kouji] higher-order-