規定|きていkitei[0]heiban (flat)

1. noun, suru verb, transitive verbstipulation; prescription; provision; regulation; rule
   この犯罪はんざいに対たいして法律ほうりつはある罰則ばっそくが規定きていされている。↗

   The law prescribes certain penalties for this offence.
2. noun, chemistrynormal (unit of normality)
3. noun, sportscompulsory exercise (in gymnastics); compulsory routine; compulsory dance (figure skating); (a) compulsory

• Synonym規則きそくNeutralThe rules as a set, e.g. 「学校の規則」; more common in daily use. 「規定」 stresses provisions written into a text and can also serve as a verb.
• SynonymルールNeutralA loanword covering rules of all kinds—games, sports, daily life—and the most common word in speech. Clauses in formal documents or legal texts are 「規定」.
• Synonym定めさだめWrittenA native word with a written/formal flavor for rules and agreements that have been laid down; it can also mean fate. 「規定」 points to clauses written into a text.
• Synonym掟おきてNeutralRules a group or community must obey, e.g. 「村の掟」, carrying a traditional, stern feel. 「規定」 leans toward institutional written provisions.
• Synonym決まりきまりNeutralAn everyday native word for rules set down to be followed, also customs, as in 「決まりを守る」. 「規定」 sounds like formal written clauses.
• Synonym法のりWrittenRead 「のり」; an elegant word for rules to keep and moral norms, also a model or the Buddhist teachings. 「規定」 is an explicit written clause.
• Related規律きりつNeutralThe discipline and order of conduct a group must keep, as in 「規律を守る」 or 「規律正しい」. 「規定」 means specific clauses put in writing.
• Related基準きじゅんNeutralA standard used as the basis for measuring or judging, e.g. 「安全基準」. 「規定」 is a clause you must follow; 「基準」 works as a yardstick for comparison.
• Related法令ほうれいFormalFormal: laws together with the orders administrative bodies issue under them—a high legal tier. 「規定」 can be any provision written in a law or internal charter.
• Related規程きていWrittenA complete set of regulations on office work and procedures set by an agency or company, e.g. 「就業規程」. 「規定」 covers provisions generally and clause by clause.
• Related原則げんそくNeutralA basic principle or general rule; in 「原則として」 it means 'in principle', with exceptions allowed. 「規定」 is a clause fixed explicitly in writing.
• Related戒律かいりつWrittenWritten/formal: precepts that must be observed in a religion, or strict moral codes more broadly. 「規定」 is a clause in a system or document.
• Related条例じょうれいFormalFormal: a law a local government enacts by assembly resolution, e.g. 「市の条例」. 「規定」 is a specific provision within any given text.
• Related準則じゅんそくWrittenA written/formal word for rules and standards one should follow, common in administrative and accounting fields. In everyday speech 「規則」 or 「基準」 will do.
• Related律りつWrittenWritten/formal: the criminal codes of ancient East Asia or Buddhist monastic rules, mostly in historical terms like 「律令」. For modern provisions, use 「規定」.
• Antonym自由じゆうNeutralFreedom to act as one pleases without constraint, e.g. 「服装は自由」—the opposite of 「規定」, which binds people through written rules.
• Antonym任意にんいWrittenWritten/formal: optional, left to the person to do or not, e.g. 「任意参加」—the opposite of 「規定」, which makes something mandatory.

Use 「規定」 for provisions written into a document—clauses in laws, charters, or sets of rules. For rules in general say 「規則」; in casual speech, 「ルール」 or 「決まり」. A complete set of internal regulations is 「規程」; a standard for measuring or judging is 「基準」. The rest are narrower: 「規律」 discipline, 「原則」 principles, 「法令」/「条例」 formal law, 「準則」 written standards, 「戒律」/「律」 religious or historical codes, 「定め」/「法」/「掟」 literary or traditional rules. Opposites: 「自由」 (free, unconstrained) and 「任意」 (optional).

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

1. 決きまりとして定さだめること、また、定さだめられた事柄ことがら。
2. 性質せいしつや概念がいねんなど、一定いっていの内容ないようをもつものとして定さだめること。