English Reference

Word

ECO

Phoneticseco

/ˈɛkoʊ/

Definitions

01environmentally friendly

B1

adj. a short way to say 'ecological' — used for products or habits that do not hurt the planet.

adj. a clipping of 'ecological', denoting products, services, or practices designed to minimize environmental impact.

“We decided to buy an eco car to reduce our carbon footprint.”

“The new housing development features several eco initiatives, including rainwater harvesting and solar-powered street lighting.”

Usage

Often used as a prefix with a hyphen (eco-friendly) or as a standalone modifier.

Antonyms

02saving money or energy

B1

adj. a short way to say 'economy' — used for settings on machines that use less electricity or water.

adj. a clipping of 'economy', specifically referring to a functional mode on appliances designed for resource efficiency.

“I always run the dishwasher on the eco setting to save on my electric bill.”

“Modern washing machines typically include an eco cycle that operates at lower temperatures for a longer duration to conserve energy.”

Usage

Commonly found on control panels and in user manuals for household appliances.

Antonyms

03eternally collapsing object

C2 · Science

n. Stands for Eternally Collapsing Object — a theoretical type of star that is like a black hole but never quite finishes collapsing.

n. Abbreviation for Eternally Collapsing Object. A theoretical alternative to black holes in astrophysics that avoids the formation of a singularity.

“The professor explained how an ECO differs from a traditional black hole model.”

“Recent theoretical papers suggest that what we observe as black holes might actually be ECOs, which lack a true event horizon.”

Technical · Academic

Usage

Used as a countable noun in theoretical physics contexts.

04engine cutoff

C1 · Science

n. Stands for Engine Cutoff — the moment when a rocket engine stops working, usually after it runs out of fuel.

n. Abbreviation for Engine Cutoff. The scheduled or unscheduled termination of a rocket engine's combustion cycle.

“The mission control team confirmed ECO three minutes after the launch.”

“The primary objective was achieved shortly before the main engine cutoff (ECO) occurred during the second stage of ascent.”

Technical

Usage

Common in aerospace engineering and NASA communications.

Antonyms

05West African currency

B2

n. the name for a new shared currency planned for several countries in West Africa.

n. The proposed name for a common currency intended for use by the Economic Community of West African States (ECOWAS).

“Many people are waiting to see when the eco will finally be launched.”

“Economists are debating whether the introduction of the eco will provide the necessary stability for regional trade in West Africa.”

Academic

Usage

Usually capitalized in formal economic reports, though often lowercase in general news.

Synonyms

Domains

AstronomyPhysics

This entry

Level
B2 · Upper Intermediate
Frequency
Frequent
Updated

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English Reference