1.
diffusion (science)
the process by which particles spread from areas of high concentration to low concentration
気体が拡散する。
The gas diffuses.
熱の拡散を防ぐ。
To prevent the diffusion of heat.
分子が水中で拡散する。
Molecules diffuse in water.
2.
spread; proliferation; dissemination
the spreading of information, ideas, or weapons to a wider area
ニュースがSNSで拡散された。
The news spread on social media.
核拡散防止が重要だ。
Nuclear non-proliferation is important.
情報の拡散が速い時代だ。
It's an era of rapid information spread.
SENSE 1 - SCIENCE:
- 拡散現象 (diffusion phenomenon)
- 拡散速度 (rate of diffusion)
- Used in physics, chemistry, biology
SENSE 2 - GENERAL SPREAD:
- 情報拡散 (information spread)
- 核拡散 (nuclear proliferation)
- SNSで拡散する (to spread on social media)
- 拡散希望 (please share - social media phrase)
USAGE:
Used as a suru-verb: 拡散する (to diffuse/spread)
MODERN USAGE:
Very common on social media to mean 'share' or 'retweet.'