一個一個

いっこいっこ

one-by-one, individual

一個

いっこ

piece, fragment, one (object)

二個メ

にこメ にこめ ニコメ

200 metre individual medley (swimming)

一個人

いちこじん いっこじん

private person, individual

一二

いちに

the first and second, a few

一個売り

いっこうり

selling individually, selling piecemeal

一二四

いちにし

four-of-a-kind and a pair in a dealt hand

一個あたり

いっこあたり

each; per piece

二礼二拍一礼

にれいにはくいちれい

two bows, two claps, and a third bow (common form of worshipping at a shrine)

個

こ コ

counter for articles

二進一退

にしんいったい

two steps forward, one step back

二分の一

にぶんのいち

a half

一石二鳥

いっせきにちょう

killing two birds with one stone

一人二役

ひとりふたやく

double role, one person playing two roles, wearing two hats

唯一無二

ゆいいつむに ゆいつむに

one and only, unique

二天一流

にてんいちりゅう

style of classical Japanese swordsmanship involving use of two swords

二者選一

にしゃせんいつ

two alternatives, selecting an option (from two alternatives)

唯一不二

ゆいいつふじ

one and only, unique

一色二順

いっしょくリャンじゅん

winning hand containing two identical chows (i.e. same numbers and same suit)