ECO

noun

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

I am passionate about eco-friendly living.

意味（1）

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

意味（2）

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