noun
major revision; far-reaching amendment; significant overhaul
Used for large-scale legal, regulatory, or systemic revisions. Often appears in news or official contexts.
来年、民法の大改正が予定されている。
A major revision of the Civil Code is scheduled for next year.
この法律は大改正を経て、より厳しい規制が盛り込まれた。
After a significant overhaul, stricter regulations were incorporated into this law.
改定 often refers to a revision of rates, prices, or rules, whereas 大改正 is used for comprehensive legal or systemic amendments.
Compound of 大 (large, great) and 改正 (revision, amendment). The exact historical derivation is uncertain, but the word follows a common pattern of prefixing 大 to indicate a major or comprehensive version of the base noun.