ECO

Noun

US abbreviation alt-of initialism

(US, astronautics) Abbreviation of engine cut-off or engine cutoff. (a NASA term for when rocket engines are shut down)

Japanese Meaning

NASAの用語で、ロケットのエンジンが停止（カットオフ）される現象を指す略語（エンジンカットオフ）

The mission controllers confirmed an ECO at T+8 minutes, indicating the first stage engines had shut down as planned.

ミッション管制はT+8分でエンジンカットオフが発生し、第一段のエンジンが計画通り停止したことを確認した。

Sense（1）

(US, astronautics) Abbreviation of engine cut-off or engine cutoff. (a NASA term for when rocket engines are shut down)

Sense（2）

(astronomy, physics) Initialism of eternally collapsing object. (a type of black hole replacement, to avoid having gravitational singularities)

ECOs

（ plural ）