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

悪党[akutou] scoundrel
一国一党主義[ikkokuittoushugi] one-party system
一党[ittou] party
一党一派[ittouippa] party
一党支配[ittoushihai] one-party rule

我党[wagatou] my party
甘党[amatou] (someone with a) sweet tooth
挙党[kyotou] entire (political) party
共産党[kyousantou] Communist Party
共産党細胞[kyousantousaibou] communist cell

お大事に[odaijini] take care of yourself
暗黒大陸[ankokutairiku] Dark Continent (i.e. Africa)
伊勢大神宮[isedaijinguu] the Grand Shrines of Ise
伊勢大廟[isetaibyou] the Grand Shrines of Ise
偉大[idai] greatness

医科大学[ikadaigaku] medical school
医大[idai] medical university
井の中の蛙大海を知らず[inonakanokawazutaikaiwoshirazu] parochial
一大[ichidai] one large ...
一大事[ichidaiji] serious affair

悪政[akusei] misgovernment
圧政[assei] despotic administration
為政家[iseika] politician
為政者[iseisha] statesman
院政[insei] government by cloistered emperors

王政[ousei] monarchy
仮政府[kariseifu] provisional government
家政[kasei] household economy
家政婦[kaseifu] housekeeper
苛政[kasei] tyranny