長久|ちょうきゅうchoukyuu[0]heiban (flat)

1. nounpermanence; perpetuity
2. nounChōkyū era (1040.11.10-1044.11.24)

• Synonym永遠えいえんNeutralThe everyday word for eternity: time going on without end, with a lyrical feel, as in 「永遠の愛」. This, not 「長久」, is what you say in daily life.
• Synonym永久えいきゅうNeutralEveryday and neutral; stresses staying unchanged forever, as in 「永久保存」. More objective than 「永遠」 and a natural stand-in for 「長久」.
• Synonym恒久こうきゅうWrittenWritten style; stresses remaining unchanged over the long term, as in 「恒久平和」.
• Synonym永代えいたいWrittenWritten word stressing continuance down the generations, as in 「永代供養」.
• Synonym永世えいせいWrittenWritten word stressing lasting forever, as in 「永世中立」.
• Synonym万世ばんせいWrittenThe same word 「ばんだい」 as above, also written 「万世」; written style, meaning endless generations to come.
• Synonym悠久ゆうきゅうWrittenWritten word stressing a long, distant stretch of history, as in 「悠久の歴史」.
• Synonym万代ばんだいWrittenWritten word stressing continuance through endless generations; close in sense to 「長久」 and common in celebratory language. Also written 「万世」.
• Synonym永劫えいごうWrittenWritten word stressing an immensely long stretch of time.
• Synonym常世とこよWrittenWritten word with a mythological tinge: eternal unchangingness, or the otherworld across the sea, land of the dead.
• Synonym千古せんこWrittenWritten word for remote antiquity or eternity, as in 「千古不易」.
• Synonym万古ばんこWrittenWritten word stressing what has held forever since ancient times, as in 「万古不易」.
• Synonym久遠くおんWrittenWritten word stressing boundlessly long time; strongly colored by Buddhist usage.
• Synonym万劫ばんごうWrittenRare written Buddhist term for endless, boundless time.
• Synonym無窮むきゅうWrittenWritten word stressing that time and space have no end, as in 「天壌無窮」.
• Related千代ちよWrittenWritten word for a thousand years, generation after generation; familiar from waka poetry and the national anthem.
• Related生々世々しょうじょうせぜWrittenRare written term with Buddhist overtones: forever, through the endless cycle of rebirth.
• Related永久とわNeutralEveryday and neutral; stresses staying unchanged forever, as in 「永久保存」. More objective than 「永遠」 and a natural stand-in for 「長久」.
• Related未来永劫みらいえいごうWrittenWritten phrase meaning forever and ever; used for emphasis, in both affirmative and negative sentences.
• RelatedとこしえWrittenPoetic written word for eternity, as in 「とこしえに」; elegant, literary flavor.
• RelatedエタニティCasualColloquial loanword for eternity; mostly seen in product names such as rings.
• Related万劫末代まんごうまつだいWrittenRare written phrase stressing continuance through endless generations to come.
• Antonym短命たんめいNeutralAntonym: a short life, or something that does not last; opposite of 「長久」 in how long a thing endures.
• Antonym一瞬いっしゅんNeutralAntonym: an instant, a mere blink of time; the extreme opposite of lasting long.

「長久」 survives mainly in fixed celebratory phrases such as 「武運長久」 and 「天長地久」, and as an era name. In daily speech use 「永遠」 (endless time, lyrical) or 「永久」 (unchanging, objective); for a long history say 「悠久」. Most other synonyms are written or literary: 「万代」「永代」「千代」 for endless generations, 「恒久」「永世」 for permanence, 「永劫」「久遠」「無窮」 for boundless time, 「千古」「万古」 for eternity since antiquity, 「未来永劫」 for strong emphasis. Antonyms: 「短命」, 「一瞬」.

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

1. 長ながく久ひさしいこと。永ながく持続じぞくすること。
2. 日本にっぽんの元号げんごうの一ひとつ。長暦ちょうりゃくの後あと、寛徳かんとくの前まえ。1040年ねん12月がつ16日か（ユリウス暦れき）から1043年ねん12月がつ16日か（ユリウス暦れき）までの期間きかんのこと。