甲こう乙おつ

noun

A and B; first and second

Used when labeling or comparing two items, options, or parties, often in formal or legal contexts. Common in phrases like 甲乙つけがたい (hard to choose between the two).

• 両りょう者しゃの実じつ力りょくは甲こう乙おつつけがたい。

  It is hard to say which of the two is better.

• 契けい約やく書しょには甲こう乙おつ双そう方ほうの署しょ名めいが必ひつ要ようです。

  The contract requires signatures from both Party A and Party B.

noun

difference in quality; superiority or inferiority

Refers to a discernible gap in quality, rank, or merit between two things. Often used in negative constructions to say there is no significant difference.

• この二ふたつの案あんに甲こう乙おつはない。

  There is no difference in quality between these two proposals.

• 性せい能のうに甲こう乙おつがあるなら、高たかい方ほうを選えらぶ。

  If there is a difference in performance, I'll choose the better one.