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

上級副社長[joukyuufukushachou] senior vice president
正副[seifuku] original and copy
副う[sou] to meet (one's expectations, etc.)
副因[fukuin] secondary cause
副会長[fukukaichou] vice president (of a club or organization, organisation)

副議長[fukugichou] vice-chairman
副業[fukugyou] side job
副見出し[fukumidashi] subhead
副作用[fukusayou] reaction

賀正[gashou] A Happy New Year!
改正[kaisei] revision
改正案[kaiseian] reform bill
規則正い[kisokutadashii] regular
旧正月[kyuushougatsu] lunisolar New Year

匡正[kyousei] reform
きょう正[kyousei] correction
憲法を改正する[kenpouwokaiseisuru] to revise the constitution
憲法改正[kenpoukaisei] constitutional reform
厳正[gensei] strictness

ぶっ通し[buttooshi] continuous
イタルタス通信[itarutasutsuushin] ITAR-TASS News Agency
インタファクス通信[intafakusutsuushin] Interfax news agency
シリアル通信[shiriarutsuushin] serial communication
タス通信[tasutsuushin] TASS News Agency

データ通信[deetatsuushin] data communication
パソコン通信[pasokontsuushin] personal computer communication
パラレル通信[pararerutsuushin] parallel communication
ビジネススクール入学共通試験[bijinesusukuurunyuugakukyoutsuushiken] business school entrance test
ロイター通信[roitaatsuushin] Reuters (news agency)