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

お宮[omiya] Shinto shrine
御宮参り[omiyamairi] shrine visit
伊勢大神宮[isedaijinguu] the Grand Shrines of Ise
王宮[oukyuu] royal palace
黄道十二宮[koudoujuunikyuu] twelve signs of the zodiac

仮宮[karimiya] temporary shrine
宮崎県[miyazakiken] Miyazaki prefecture (Kyushu)
宮参り[miyamairi] shrine visit
宮司[guuji] chief priest
宮城[kyuujou] Imperial Palace