一対|いっついittsui[0]heiban (flat)

1. no-adjectivepair; couple

• SynonymペアNeutralLoanword for a pair of two people or things; common in speech, as in 「ペアルック」「ペアを組む」. 「一対」 leans written/formal.
• SynonymカップルNeutralLoanword for a couple—two people in a romantic relationship or marriage. 「一対」 can refer to any paired people or things.
• RelatedアベックNeutralLoanword (from French) for a man and woman out together, a couple. Now dated; everyday speech uses 「カップル」 instead.
• RelatedデュオNeutralLoanword for a duo: an instrumental or vocal duet, or a two-person act. Leans musical; 「一対」 is not limited to people.
• Related二人組ふたりぐみNeutralTwo people acting together as a pair or team, as in 「二人組の強盗」. People only, while 「一対」 mostly refers to paired things.
• RelatedつがいNeutralA mated pair of animals, male and female, as in 「鳥の番い」. 「一対」 is not limited to animals and covers any paired things.
• Antonym単体たんたいWrittenA single, standalone item or unit—the opposite of two things forming a set like 「一対」. Written/formal prose.

Use 「一対」 for a pair of two things, as in 「一対の狛犬」; it leans written. In speech, 「ペア」 is the usual word for a pair of people or things, 「カップル」 for a couple, and 「番い」 for a mated pair of animals.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 二ふたつで一いち組くみとなること。また、そのようなもの。