膨張

• Reading: ぼうちょう
• Romaji: bouchou
• Kanji breakdown: 膨 (bou) — swell, expand; 張 (chou) — stretch, spread
• Pronunciation: /boː.tɕoː/

Meaning

Expansion; swelling; the process of growing larger in size, volume, or scale.

A noun (and suru verb) for physical or metaphorical expansion. Used in science (熱膨張, thermal expansion), economics (財政膨張, fiscal expansion), and general descriptions of growth. Implies continuous or uncontrolled growth, often with a slightly negative connotation when applied to budgets or organisations.

Examples

1. 金属は熱で膨張する性質がある。 Metal has the property of expanding when heated.
2. 会社の急激な膨張が経営を圧迫している。 The company's rapid expansion is putting pressure on management.
3. 宇宙は今も膨張し続けていると言われている。 The universe is said to still be expanding.

Usage Guide

Context: science, economics, astronomy, physics

Tone: technical

Origin & History

From Sino-Japanese 膨 (bou, to swell/expand) + 張 (chou, to stretch/spread). Literally 'to swell and stretch,' vividly describing the process of increasing in size.

Cultural Context

Era: Classical

Generation: Adults

Social background: Educated