交際|こうさいkousai[0]heiban (flat)
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- noun, suru verb, intransitive verbcompany; friendship; association; society; acquaintance
- noun, suru verb, intransitive verb(romantic) involvement; dating
Conjugation
| Dictionary form | 交際する(こうさいする) |
|---|---|
| Polite (masu) | 交際します(こうさいします) |
| Negative (nai) | 交際しない(こうさいしない) |
| polite (masen) | 交際しません(こうさいしません) |
| classical zu / nu | 交際せず・交際せぬ(こうさいせず・こうさいせぬ) |
| Past (ta) | 交際した(こうさいした) |
| polite (mashita) | 交際しました(こうさいしました) |
| Past negative (nakatta) | 交際しなかった(こうさいしなかった) |
| polite (masen deshita) | 交際しませんでした(こうさいしませんでした) |
| Te form | 交際して(こうさいして) |
| Potential | 交際できる(こうさいできる) |
| Passive | 交際される(こうさいされる) |
| Causative | 交際させる(こうさいさせる) |
| Causative passive | 交際させられる(こうさいさせられる) |
| Conditional (ba) | 交際すれば(こうさいすれば) |
| tara | 交際したら(こうさいしたら) |
| Volitional | 交際しよう(こうさいしよう) |
| polite (mashou) | 交際しましょう(こうさいしましょう) |
| Imperative | 交際しろ(こうさいしろ) |
Common forms generated by rule; see the senses for honorific or irregular usage.
- Synonym付き合いつきあいNeutralThe most common everyday word for socializing and dealing with people; 「交際」 is more formal and often refers to romantic dating.
- Synonym交わりまじわりWrittenWritten word for association; can also mean sexual intercourse or intersection. In everyday speech, say 「付き合い」.
- Synonym社交しゃこうNeutralSocializing in society or at social occasions, as in 「社交ダンス」; 「交際」 is more about personal relationships.
- Synonym交遊こうゆうWrittenWritten word for one's social contacts and comings and goings, as in 「交遊関係」; centers on friendly ties, not romance.
- Synonym人付き合いひとづきあいNeutralGetting along and dealing with people, as in 「人付き合いが苦手」 (not good at dealing with people); never about romance.
- Synonym交誼こうぎWrittenRare written word for friendship and goodwill, mostly in speeches and letters; for everyday association use 「付き合い」.
- Synonym友交ゆうこうWrittenRare written word for friendly association; in daily speech say 「付き合い」.
- Related友好ゆうこうWrittenWritten word mostly for friendly relations between nations or organizations; 「交際」 is personal association.
- Relatedお付き合いおつきあいCasualPolite spoken form of 「付き合い」, common in conversation; also used for dating; 「交際」 is more formal.
- Antonym絶交ぜっこうWrittenWritten antonym: breaking off association, ending all contact with someone.
- Antonym孤立こりつNeutralAntonym: having no ties with others, left isolated and without support.
「交際」 is the formal word for people associating or for a romantic relationship. Everyday socializing is 「付き合い」 (polite 「お付き合い」); getting along with people is 「人付き合い」; the social scene is 「社交」. The opposite is 「絶交」.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only


