慣習|かんしゅうkanshuu[0]heiban (flat)

1. nouncustom; convention; common practice
   我々われわれは地方ちほうの慣習かんしゅうを尊重そんちょうしなくてはならない。↗

   We have to respect local customs.
2. noun, suru verbbecoming accustomed (to)

• Synonym習慣しゅうかんNeutralThe everyday word for habits, personal or social. 「慣習」 is a written, formal term for long-established rules of society only, never an individual's habits.
• Synonym習わしならわしNeutralCustoms handed down through generations, as in 「土地の習わし」, with a traditional flavor. 「慣習」 sounds more objective and turns up in legal and academic writing.
• Synonym習いならいWrittenWritten word for the way life normally goes, as in 「世の習い」, with a wistful, reflective tone. 「慣習」 means concrete social rules, not the natural order of things.
• Synonym慣行かんこうWrittenPractices actually and widely followed, as in 「商慣行」, applicable to any group. 「慣習」 leans toward long-established rules; the two are often interchangeable.
• Synonym慣例かんれいWrittenConventions or precedents followed repeatedly, as in 「慣例に従う」. 「慣習」 points to customs of society at large, 「慣例」 to concrete practices.
• Synonym伝統でんとうNeutralCustoms and ideas handed down through generations, stressing cultural heritage and its value. 「慣習」 stresses the rules that prevail in society.
• Synonym風習ふうしゅうNeutralCustoms of life handed down in a particular place, stressing local character. 「慣習」 is not tied to a region and is common in legal and social contexts.
• Synonym風俗ふうぞくNeutralEveryday customs of an era or region, and also public morals; today it frequently refers to the sex industry. To talk about social conventions, 「慣習」 is the safer choice.
• Synonym因習いんしゅうWrittenWritten word for outdated, undesirable customs, always pejorative, as in 「因習を打破する」. 「慣習」 itself is neutral, with no positive or negative charge.
• Synonym習俗しゅうぞくWrittenWritten, folkloristic term for the customs that have formed in a place. 「慣習」 centers on social norms and is the usual word in legal contexts.
• Related定例ていれいWrittenWritten word for an established routine, including events held at fixed intervals, as in 「定例会」. 「慣習」 carries no implication of a regular schedule.
• Related恒例こうれいNeutralAn event held as usual at a set time or by custom, as in 「恒例の花火大会」. 「慣習」 is not restricted to recurring events.
• Related決まりきまりNeutralCovers both explicit rules of schools and organizations and unwritten conventions; very common in speech. 「慣習」 refers only to customs and conventions.
• Related常習じょうしゅうWrittenWritten word for a habit of repeating something, usually bad, as in 「常習犯」. 「慣習」 is a social convention—never pejorative and never about individuals.
• Related定石じょうせきNeutralOriginally the standard sequences in go, extended to accepted best practice, as in 「定石通り」. 「慣習」 is social custom, with no idea of the optimal play.
• RelatedトラディションNeutralLoanword for tradition, rarely used in daily speech—「伝統」 is the usual choice. It stresses cultural inheritance, while 「慣習」 is about rules that govern society.
• RelatedしきたりNeutralOld rules kept by a family or region, as in 「家のしきたり」, carrying a sense of obligation. 「慣習」 is more objective and mostly used at the level of society.
• Related俗習ぞくしゅうWrittenWritten word for worldly folkways, now rarely seen. It leans toward folk custom; in most cases 「慣習」 or 「風習」 is the natural choice.
• Related御定まりおさだまりNeutralThe same old predictable routine, as in 「お定まりのコース」, often with a teasing tone. 「慣習」 means social rules and has no such mocking shade.
• Related旧習きゅうしゅうWrittenWritten word for old customs, often implying they are outdated and should be done away with. 「慣習」 is neutral and carries no such judgment.
• Related古例これいWrittenWritten word for precedents from the distant past, rarely used today. It stresses precedents one can point to; in everyday contexts 「慣例」 is the usual word.
• Related常例じょうれいWrittenWritten word for the usual practice, uncommon today. It leans toward concrete routine procedures; for everyday use 「慣例」 is enough.
• Related遺風いふうWrittenWritten word for customs or teachings left by earlier generations that still exert influence. 「慣習」 is about rules in force now, not a legacy.
• Related旧例きゅうれいWrittenWritten word for conventions inherited from the past, with a distinctly dated feel. 「慣習」 covers rules current in society without stressing their age.
• Related風儀ふうぎWrittenWritten word for local customs and codes of behavior, including manners and deportment; rare today. 「慣習」 covers only social conventions, not personal conduct.

Choose 「慣習」 for long-established rules of society, as in 「慣習法」. For personal habits use 「習慣」; for practices actually followed 「慣行」; for precedents 「慣例」; for recurring events 「恒例」; for outdated bad customs 「因習」. 「習わし」「仕来り」「風習」 add traditional or local color, 「伝統」 stresses cultural heritage, and 「決まり」 is the everyday word for rules. Note too that 「定例」 adds a fixed schedule, 「遺風」 a lingering legacy, 「旧習」 a sense of customs to discard, and 「風俗」 now often means the sex industry.

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

1. ある社会しゃかいにおいて一般いっぱんにおこなわれるようになっていること。習ならわし。しきたり。