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

タイ国[taikoku] Thailand
ドイツ民主共和国[doitsuminshukyouwakoku] German Democratic Republic (i.e. former East Germany)
ドイツ連邦共和国[doitsurenpoukyouwakoku] Federal Republic of Germany (former West Germany)
亜米利加合衆国[amerikagasshuukoku] United States of America
愛国[aikoku] love of (one's) country

愛国者[aikokusha] patriot
愛国主義[aikokushugi] nationalism
愛国心[aikokushin] patriotic feelings
夷国[ikoku] land of the barbarians
異国[ikoku] foreign country

一箇年[ikkanen] one year
一箇[ikko] piece
何箇月[nankagetsu] how many months?
箇月[kagetsu] (number of) months
箇条[kajou] items

三箇日[sanganichi] first three days of the New Year (January 1st to 3rd)
信仰箇条[shinkoukajou] articles of faith
二箇所[nikasho] two parts
別箇[bekko] another

オブジェクト指向言語[obujekutoshikougengo] object-oriented language
コンピュータ用語[konpyuutayougo] computerese
スウェーデン語[suweedengo] Swedish (language)
スペイン語[supeingo] Spanish (language)
スワヒリ語[suwahirigo] Swahili (language)

チャン語[chango] Chinese (language)
ドイツ語[doitsugo] German (language)
フランス語[furansugo] French (language)
プログラム言語[puroguramugengo] programming language
ペルシャ語[perushago] Persian (language)