半ば・中ば|なかばnakaba[0]heiban (flat)

1. noun, noun (suffix)middle; halfway; midway
   このボートのエンジンがハワイへの航路こうろのなかばで駄目だめにならなければよいね。↗

   Let's hope this boat engine doesn't give up the ghost when we're halfway to Hawaii.

   彼女かのじょは４０代だい半なかばで再婚さいこんした。↗

   She married again in her mid-forties.
2. nounhalf (of); one half
   人生じんせいとは何なんであるかを知しったとき、すでに生涯しょうがいの半なかばは過すぎている。↗

   Life is half spent before we know what it is.
3. adverbhalf (e.g. done, jokingly); partly; in part; partially
   出でだしがよければ半なかばやり遂とげたようなものだ。↗

   Well begun is half done.
4. adverbmostly; almost; nearly

• Synonym真ん中まんなかNeutralColloquial term for the exact middle, in space or time; 「半ば」 usually marks a point partway through a process, and can also mean half or partly.
• Synonym中間ちゅうかんNeutralPosition between two things, or a midway point; seen in set phrases like 「中間報告」. Somewhat formal in tone.
• Synonym半分はんぶんNeutralHalf, with the focus on a quantity split in two; 「半ば」 leans toward a point midway through, and as an adverb can mean half- or partly.
• SynonymハーフNeutralLoanword for half; also used for a biracial person or one half of a match.
• SynonymミドルNeutralLoanword for middle or middle age, usually as the first element of a compound.
• Related中葉ちゅうようWrittenWritten prose for the middle of an era, as in 「19世紀中葉」.
• Related半はんNeutralHalf, mostly as a prefix in compounds like 「半年」「半透明」, or for half past the hour.
• Related半数はんすうNeutralHalf the number of a total, as in 「半数以上」; restricted to countable quantities.
• Related中部ちゅうぶNeutralThe central part of something, or Japan's Chūbu region; spatial, whereas 「半ば」 centres on progress through a process.
• Related半額はんがくNeutralHalf the price or amount of money, as in 「半額セール」; 「半ば」 is not used for prices.
• Related一部分いちぶぶんNeutralOne part of a whole, not necessarily half; 「半ば」 suggests roughly half or a midpoint.
• Related中位ちゅういNeutralA middle position or grade; overlaps with 「半ば」 only in the loose sense of being in the middle.
• Related真っ只中まっただなかNeutralRight in the very middle, or the height of something at its most intense; 「半ば」 covers midway through, half, or partly.
• Related中頃なかごろNeutralThe middle stretch of a period, as in 「来月の中頃」; close to 「半ば」 but more colloquial.
• Related中ほどなかほどNeutralThe middle area of a location or a span of time; more casual than 「半ば」.
• Related只中ただなかWrittenWritten word for the very centre or the peak of something; 「半ば」 stresses being partway through a process.
• Related真中まなかWrittenRare written variant for the exact centre; in ordinary use say 「真ん中」.
• Related中くらいちゅうくらいNeutralColloquial word for medium in size or degree, not tied to time; 「半ば」 usually marks a process partway through.
• Related一半いっぱんWrittenRare written word for half; normally say 「半分」.
• Related二分の一にぶんのいちNeutralThe precise mathematical one-half, or 50%; 「半ば」 is vaguer.
• Antonym端はしNeutralThe end or edge of something, the opposite pole from the middle sense of 「半ば」.
• Antonym極端きょくたんNeutralSkewed far to one side, or the farthest edge; contrasts with 「半ば」 only as edge versus middle.

Use 「半ば」 for a point partway through a time span or process, or for half-/partly states. For the exact centre of space or time say 「真ん中」; for half of a quantity, 「半分」 is the usual word (「半数」 for counts, 「半額」 for prices); for the middle of an era say 「中頃」, or 「中葉」 in writing. 「中間」 covers the space between two things, 「真っ只中」 the very midst or height of something, 「中ほど」 a casual middle area, 「ハーフ」 and 「ミドル」 are loanwords, 「半」 a prefix, 「二分の一」 the precise 50%, and 「端」「極端」 the opposite edges.

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

1. 進行しんこうの中間ちゅうかんあたり。途中とちゅう。