伝播（でんぱ、denpa）
- propagation

The Japanese word 伝播 (でんぱ, *denpa*) means "propagation," "spread," "transmission," or "diffusion." It refers to the process by which something, such as information, a disease, or a physical phenomenon, spreads or extends from one place or person to another. This spreading can occur in various contexts, from a simple rumor to the spread of radio waves. It often implies a process of continuous or progressive expansion. The word conveys the idea of something moving outwards, affecting a wider area or group over time. The concept of 伝播 includes both the *action* of spreading and the *result* of that spreading.

⚫︎情報がインターネットを通じて世界中に伝播］した。 Translation: Information spread across the world through the internet. ⚫︎新型ウイルスが急速に伝播］している。 Translation: The new virus is spreading rapidly. ⚫︎その考え方は、多くの人々に伝播］した。 Translation: That way of thinking spread to many people.

伝播 is used in formal and informal contexts. It's suitable for describing various types of spread: ideas, technologies, diseases, news, etc. It works in written and spoken Japanese. The verb is often used to describe how something moves outward. You can use this word with a subject that is doing the spreading and an object that the spreading is influencing. It's often paired with words indicating speed or scale, like "rapidly" (急速に, *kyuusoku ni*) or "widely" (広く, *hiroku*). The particle が (*ga*) typically precedes the subject of the 伝播.

伝播 is written using the kanji 伝 (den, to, tsutawaru: convey, transmit), and 播 (ha, maku: sow, spread). The word is read でんぱ (*denpa*) in hiragana. There is not a katakana version for this word. The okurigana is generally not modified. The root form is 伝播する (*denpa suru*) and it is a suru-verb. Its conjugations are formed by attaching the appropriate verb endings to the stem 伝播. For example, 伝播しました (*denpa shimashita*: spread, past polite), 伝播しない (*denpa shinai*: does not spread, present negative).

⚫︎普及（ふきゅう, *fukyuu*): widespread use, popularization ⚫︎拡散（かくさん, *kakusan*): diffusion, scattering ⚫︎広がる（ひろがる, *hirogaru*): to spread out, to extend ⚫︎流布（るふ, *rufu*): circulation, dissemination (often used for ideas or rumors) ⚫︎浸透（しんとう, *shintou*): penetration, permeation (often used for ideas or culture)

⚫︎収束（しゅうそく, *shuusoku*): convergence, stabilization ⚫︎抑制（よくせい, *yokusei*): suppression, restraint ⚫︎終息（しゅうそく, *shuusoku*): end, cessation (of spreading)

デマはSNSを通じて瞬く間に伝播］した。 ・Translation: The false rumor spread in a flash through social media. ・Explanation: This sentence illustrates how a negative piece of information, a rumor, spreads rapidly due to the internet.

この技術は世界中に伝播］し、人々の生活を変えた。 ・Translation: This technology spread throughout the world and changed people's lives. ・Explanation: This example explains the 伝播 of a helpful technology and the resultant change.

The kanji 伝 (den, to, tsutawaru) means "to convey" or "to transmit." The kanji 播 (ha, maku) means "to sow" or "to spread." Together, these kanji imply the act of transmitting or spreading something, similar to scattering seeds to grow. The word's meaning is therefore very direct: the act of passing something from one place to another, or from one person to another.