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📕 rednote ID(小红书号)：3881567312

Emission: Definition, Usage & Common Examples (2 meaning)

Meaning 1：act of releasing (emission)

emission 🔊

/ɪˈmɪʃ(ə)n/

The act or process of sending something out, like gas, light, or sound.

Emission illustration: car exhaust pipe releasing fumes into the air

act of releasing 🔊

➕

/ækt əv rɪˈliːsɪŋ/

Refers specifically to the process or action of discharging something, such as gases, particles, light, or sound, into the surrounding environment.

📁 Category：Laws & Regulations 🔖 Level：Intermediate

📘 Details & Usage

📖 Root Explanation

From Latin 'emissio' (a sending out), from 'e-' (out) + 'mittere' (to send).

💡 Mnemonic

Think of 'E-mission' as an electronic signal being sent 'out' (E for exit). You're on a mission to send something out.

📖 Example

The new law aims to strictly control the emission of harmful gases from factories. 🔊 The new law aims to strictly control the act of releasing harmful gases from factories.

🔗 Collocations

carbon emission – The release of carbon dioxide into the atmosphere.

emission control – Technology or regulations designed to limit pollutants released from sources like vehicles.

zero emission – Producing no harmful substances that are released into the environment.

🔄 Synonyms

discharge (n.) – The action of releasing a substance, often used for liquids or electricity.

release (n.) – The action of setting something free or allowing it to escape.

exhalation (n.) – The process of breathing out; specifically for breath or vapor.

🚫 Antonyms

absorption (n.) – The process by which one substance takes in another.

retention (n.) – The continued possession or holding of something.

containment (n.) – The action of keeping something harmful under control or within limits.

🌱 Derivatives

emit (v.) – To produce and discharge something.

emissive (adj.) – Having the power to radiate or send out.

emitter (n.) – A source that releases something.

📖 Cultural Story

The word 'emission' entered English from Latin in the early 17th century, originally meaning the act of sending forth. Its use in physical sciences (light, heat) emerged later. Today, it is a cornerstone term in environmental discussions, central to policies regulating greenhouse gas emissions.

Meaning 2：substance released (emission)

emission 🔊

/ɪˈmɪʃ(ə)n/

Something that is sent out, such as the gas, light, or heat itself.

Emission diagram: industrial factory chimneys releasing smoke substances

substance released 🔊

➕

/ˈsʌbstəns rɪˈliːst/

Refers to the substance or form of energy (like gas, light, or heat) that is itself discharged or radiated from a source.

📁 Category：Natural Geography 🔖 Level：Intermediate

📘 Details & Usage

📖 Example

The main emission from burning coal is carbon dioxide, which affects the climate. 🔊 The primary substance released from burning coal is carbon dioxide, which affects the climate.

🔗 Collocations

greenhouse gas emissions – Gases like CO2 and methane that are released and trap heat in the atmosphere.

light emission – Radiation in the form of visible light given off by a source.

automotive emissions – Pollutants released from vehicle exhaust systems.

🔄 Synonyms

effluent (n.) – Liquid waste or sewage discharged into a river or the sea.

pollutant (n.) – A substance that pollutes something, especially water or the atmosphere.

exhaust (n.) – Waste gases or air expelled from an engine or other machine.

🚫 Antonyms

input (n.) – What is put in, taken in, or operated on by any process or system.

intake (n.) – An amount of food, air, or another substance taken into the body.