膨張・膨脹|ぼうちょうbouchou[0]heiban (flat)
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Which spelling to use
膨張膨張 is the more common written form of this word. Beginners should use it when choosing between the two kanji spellings.
膨脹膨脹 is a less common written variant of 膨張. Recognize it when encountered, but do not choose it as your default.
Definitions
- noun, suru verb, intransitive verbexpansion; swelling; increase; growth
Conjugation
| Dictionary form | 膨張する（ぼうちょうする） |
|---|---|
| Polite (masu) | 膨張します（ぼうちょうします） |
| Negative (nai) | 膨張しない（ぼうちょうしない） |
| polite (masen) | 膨張しません（ぼうちょうしません） |
| classical zu / nu | 膨張せず・膨張せぬ（ぼうちょうせず・ぼうちょうせぬ） |
| Past (ta) | 膨張した（ぼうちょうした） |
| polite (mashita) | 膨張しました（ぼうちょうしました） |
| Past negative (nakatta) | 膨張しなかった（ぼうちょうしなかった） |
| polite (masen deshita) | 膨張しませんでした（ぼうちょうしませんでした） |
| Te form | 膨張して（ぼうちょうして） |
| Potential | 膨張できる（ぼうちょうできる） |
| Passive | 膨張される（ぼうちょうされる） |
| Causative | 膨張させる（ぼうちょうさせる） |
| Causative passive | 膨張させられる（ぼうちょうさせられる） |
| Conditional (ba) | 膨張すれば（ぼうちょうすれば） |
| tara | 膨張したら（ぼうちょうしたら） |
| Volitional | 膨張しよう（ぼうちょうしよう） |
| polite (mashou) | 膨張しましょう（ぼうちょうしましょう） |
| Imperative | 膨張しろ（ぼうちょうしろ） |
Common forms generated by rule; see the senses for honorific or irregular usage.
Synonyms & antonyms
- Synonym拡大かくだいNeutralFor growth in scale or scope. 「膨張」 stresses physical swelling in volume, or the overexpansion of budgets and cities.
- Synonym拡張かくちょうNeutralDeliberate expansion of territory, facilities or functions. 「膨張」 stresses swelling in volume or ballooning scale.
- Synonym増大ぞうだいNeutralFor growth in scale or degree. 「膨張」 stresses swelling in volume.
- Synonym膨れるふくれるNeutralA verb for swelling out, also for sulking or pouting. 「膨張」 leans toward written prose.
- Related増加ぞうかNeutralFor increases in quantity, as in 「人口増加」. 「膨張」 stresses swelling in volume or excessive expansion.
- Related増殖ぞうしょくNeutralFor multiplication and proliferation, especially of cells. 「膨張」 stresses swelling in volume.
- Related膨らむふくらむNeutralA verb for bulging or swelling up, also used of hopes swelling. 「膨張」 is a noun and leans toward written prose.
- Related伸長しんちょうWrittenWritten prose for elongation and extension. 「膨張」 stresses swelling in volume.
- Related広がるひろがるNeutralFor spreading out or fanning across an area. 「膨張」 stresses swelling in volume or excessive expansion.
- Related伸びるのびるNeutralFor lengthening or growth, as in business performance. 「膨張」 stresses swelling in volume or excessive expansion.
- Related上昇じょうしょうNeutralFor rises in figures or temperature. 「膨張」 stresses swelling in volume or excessive expansion.
- Related展開てんかいNeutralFor plots unfolding or business being rolled out. 「膨張」 stresses swelling in volume.
- Related発展はってんNeutralFor development and growth. 「膨張」 stresses swelling in volume and often carries a nuance of excess.
- Related広がりひろがりNeutralA noun for extent or breadth. 「膨張」 stresses swelling in volume.
- RelatedのびNeutralA noun for growth or stretching. 「膨張」 stresses swelling in volume.
- Related膨れ上がるふくれあがるNeutralFor ballooning or swelling up sharply, as in 「赤字が膨れ上がる」. 「膨張」 leans toward written prose.
- Related伸展しんてんWrittenWritten prose for stretching and extending. 「膨張」 stresses swelling in volume.
- Antonym収縮しゅうしゅくNeutralThe antonym: where 「膨張」 is swelling up, 「収縮」 is contraction or shrinking.
「膨張」 is the default for swelling in volume and for overexpansion of budgets or cities, as in 「熱膨張」. For a verb of bulging, use 「膨らむ」; for a sharp surge, 「膨れ上がる」. For growth in scale or scope, pick 「拡大」; for increases in quantity, 「増加」. The antonym is 「収縮」.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only
Japanese definitions
Kanji in this word
English equivalents
See also
