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

鍬入れ式[kuwaireshiki] ground-breaking ceremony
オギノ式[oginoshiki] Ogino method
サイクルアンドライド方式[saikuruandoraidohoushiki] cycle and ride system
シーアンドエア方式[shiiandoeahoushiki] sea and air system
シーリング方式[shiiringuhoushiki] ceiling system

シップエア方式[shippueahoushiki] ship air system
スキャンロン方式[sukyanronhoushiki] Scanlon plan
違式[ishiki] informality
一括式[ikkatsushiki] batch mode
一式[isshiki] complete set

彼の方[anokata] that gentleman (lady)
此方[kochira] this way (direction close to the speaker or towards the speaker)
此方[konata] this way
其方[sochira] that way (direction distant from the speaker, close to the listener)
何方へ[dochirahe] how are you?

何方も[dochiramo] both
何方様[dochirasama] who
何方付かず[docchitsukazu] gray area
何方でも[donatademo] anyone
遣り方[yarikata] manner of doing

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-

それ程[sorehodo] to that degree
程々[hodohodo] moderately
マルコフ過程[marukofukatei] Markov process
音程[ontei] musical interval
課程[katei] course

過程[katei] process
会議日程[kaiginittei] conference program
改革過程[kaikakukatei] reform process
確率過程[kakuritsukatei] stochastic process
規程[kitei] official regulations