更改|こうかいkoukai[0]heiban (flat)

1. noun, suru verb, transitive verbrenewal; extension; revision

• Synonym刷新さっしんWrittenWritten. A thorough overhaul that sweeps away the old, as in 「人事を刷新する」; stronger in tone than 「更改」.
• Synonym更新こうしんNeutralNeutral and far more common than 「更改」; covers renewals, updates and record-breaking, as in 「契約更新」.
• Synonym改新かいしんWrittenWritten; reforming institutions and systems, now mostly in the historical name 「大化の改新」.
• Synonym改変かいへんNeutralNeutral; altering content so it differs from the original, as in 「遺伝子改変」 or 「データの改変」.
• SynonymリニューアルNeutralNeutral loanword for renovating or revamping shops, products and services, as in 「リニューアルオープン」.
• Synonym更始こうしWrittenWritten and rare; means casting off the old and starting anew.
• Synonym変改へんかいWrittenWritten and rare; changing or revising something, and by extension breaking a promise one has made.
• Related一新いっしんWrittenWritten; giving something a complete facelift, as in 「面目を一新する」; stresses renewing everything, not just parts.
• Related改めるあらためるNeutralNeutral verb with broad uses — correcting, revising, changing — as in 「規則を改める」.
• Related変えるかえるCasualColloquial verb, the everyday word for changing something; 「更改」 is its written, formal counterpart.
• Related改良かいりょうNeutralNeutral; improving quality so something works better, as in 「品種改良」; the aim is better, not merely new.
• Antonym据置WrittenWritten antonym; keeping things as they are, as in 「価格据え置き」 — the opposite of changing them through 「更改」.

Use 「更改」 in written or formal contexts for replacing something old with a new version, as in 「契約更改」 or 「システム更改」; in law it means substituting a new obligation for an old one. To renew a contract say 「更新」; for a sweeping or complete makeover use 「刷新」 or 「一新」; to keep terms unchanged, 「据え置き」.

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

1. 変かえて新あたらしくすること。
2. 当事者とうじしゃや給付きゅうふ等とうの債務さいむの内容ないようを変更へんこうすること。またその契約けいやく。