\ ˈgas How to pronounce gas (audio) \
plural gases also gasses

Definition of gas

 (Entry 1 of 2)

1 : a fluid (such as air) that has neither independent shape nor volume but tends to expand indefinitely
2a : a combustible gas or gaseous mixture for fuel or lighting especially : natural gas
b : a gaseous product of digestion also : discomfort from this
c : a gas or gaseous mixture used to produce anesthesia
d : a substance that can be used to produce a poisonous, suffocating, or physically irritating atmosphere
3 : empty talk : bombast His talk about quitting his job was all gas.
4 : gasoline also : the accelerator pedal of an automotive vehicle
5 : driving force : energy I was young, and full of gas— H. L. Mencken ran out of gas in the seventh inning
6 slang : something that gives pleasure : delight the party was a gas
7 baseball, informal : fast and powerfully thrown pitches : smoke sense 8 That's Nate on the mound in the glossy photo in his dad's office, throwing gas in some Little League game.— Austin Murphy


gassed; gassing

Definition of gas (Entry 2 of 2)

intransitive verb

1 : to talk idly or garrulously
2 : to give off gas (see gas entry 1 sense 1)
3 : to fill the tank (as of an automobile) with gasoline usually used with up

transitive verb

1 : to supply with gas or especially gasoline gas up the car
2a : to treat chemically with gas
b : to poison or otherwise affect adversely with gas
3 slang : to please greatly

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Examples of gas in a Sentence


Carbon monoxide is a poisonous gas. We heat our house with gas. Do you have a gas stove or an electric one? The car gets good gas mileage. The car almost ran out of gas. He was driving with one foot on the gas and one foot on the brake.


soldiers gassed on the battlefield We stopped to gas the car.
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Recent Examples on the Web: Noun

Above all, automakers are rushing to make electric cars to meet tighter rules on greenhouse gas emissions and pollutants, particularly in the European Union and China. Washington Post, "Volkswagen bets big on electric. Will consumers buy in?," 10 Sep. 2019 Those include three seismometers to measure earthquakes, three GPS instruments to chart ground deformation and one instrument to monitor gas emissions at four different locations on the mountain. Shannon Hall, New York Times, "We’re Barely Listening to the U.S.’s Most Dangerous Volcanoes," 9 Sep. 2019 Climate Action Playbook The Sunnyvale City Council last month unanimously adopted the Climate Action Playbook, the city’s new plan to reduce greenhouse gas emissions that cause climate change. Anne Gelhaus, The Mercury News, "Sunnyvale community briefs for the week of Sept. 13," 8 Sep. 2019 The rollback will mean $14 billion a year in higher energy costs and add to the nation’s greenhouse gas emissions, according to a study by the Appliance Standards Awareness Project and the American Council for an Energy-Efficient Economy. The Washington Post, Twin Cities, "Energy Department scraps light bulb standards set during Obama era," 6 Sep. 2019 In fact, household behavior can make a substantial difference reducing greenhouse gas emissions, according to researchers from Michigan State University and Vanderbilt University. Amy Chillag, CNN, "Changing your energy-wasting ways is very doable. Take it one step at a time," 30 Aug. 2019 Before turning to those issues, it must be noted that international efforts to achieve major reductions in greenhouse gas emissions have largely failed. Robert Bryce, National Review, "Why Climate Action Flopped at the G-7," 26 Aug. 2019 Transportation, generally the automobile, is the United States’ biggest contributor to greenhouse gas emissions, which affect climate change. Randy Essex, Detroit Free Press, "Why Trump is using Henry Ford, gas mileage to call out automakers on Twitter," 22 Aug. 2019 Finally, nations will have to aggressively curb greenhouse gas emissions. Chris Free, The Conversation, "Ocean warming has fisheries on the move, helping some but hurting more," 19 Aug. 2019

Recent Examples on the Web: Verb

But the forces unleashed by China’s modernization over the past thirty years cannot be tear-gassed away. Jonathan Kaufman,, "Are Hong Kong protests a preview of China’s uncertain future?," 6 Sep. 2019 The production is gassed up by some flat-out spectacular numbers. Andrea Simakis,, "‘Bat Out of Hell — The Musical’ in New York is a gloriously messy, over-the-top fever dream of fun," 30 Aug. 2019 Since then, the staff has been gassing up the police patrol cars and other vehicles at local gas stations with credit cards from Wex Inc., which also provides a system of accounting reports, spending controls, tracking and purchase alerts. Kimberly Fornek,, "Hinsdale’s gas costs to rise $5,350 annually with switch from using its own fuel tanks," 6 Aug. 2019 In his first few games, Gordon showed both his talent and the effect of missing so many games over so many seasons, as he was gassed after some long gains. Kevin Cullen,, "Josh Gordon’s biggest impact might come off the field," 19 Aug. 2019 Males—roughly 7 billion per year worldwide, according to industry estimates—are fed into a shredder or gassed. Gretchen Vogel, Science | AAAS, "‘Ethical’ eggs could save male chicks from mass slaughter," 14 Aug. 2019 Carson said her agency’s legal observers have been among people in protest crowds who have been tear-gassed, shot with rubber balls and unlawfully detained during Portland demonstrations., "Portland woman injured by police flash-bang grenade while protesting right-wing rally sues city," 5 Aug. 2019 Though this weekend's protest was largely peaceful, according to reports, previous demonstrations have seen Hong Kongers tear-gassed, fired at with rubber bullets and brutalised by police. Natalie Gil,, "Diary From Hong Kong: 24 Hours With A Young Woman Protesting," 18 June 2019 After 26 minutes of practice Sunday, Brown was already gassed. Mike Preston,, "Mike Preston’s observations on Ravens’ rookie receiver Marquise Brown," 12 Aug. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'gas.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of gas


1779, in the meaning defined at sense 1


1852, in the meaning defined at intransitive sense 1

History and Etymology for gas


New Latin, alteration of Latin chaos space, chaos


derivative of gas entry 1

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Learn More about gas

Dictionary Entries near gas






gas attack


Statistics for gas

Last Updated

13 Sep 2019

Look-up Popularity

Time Traveler for gas

The first known use of gas was in 1779

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More Definitions for gas



English Language Learners Definition of gas

 (Entry 1 of 2)

: a substance (such as oxygen or hydrogen) that is like air and has no fixed shape
: a gas or mixture of gases that is burned as a fuel
US : gas in your stomach and intestines that causes pain or discomfort



English Language Learners Definition of gas (Entry 2 of 2)

: to poison or kill (someone) with gas
US : to put gasoline in (a car, truck, etc.)


\ ˈgas How to pronounce gas (audio) \
plural gases

Kids Definition of gas

 (Entry 1 of 2)

1 : a substance (as oxygen or hydrogen) having no fixed shape and tending to expand without limit
3 : a gas or a mixture of gases used to make a person unconscious (as for an operation)
4 : a substance that poisons the air or makes breathing difficult
5 : gasoline
6 : a gaseous product of digestion or the discomfort caused by it


gassed; gassing; gasses

Kids Definition of gas (Entry 2 of 2)

1 : to poison with gas “Her boy was gassed in the trenches,” Grandma said.— Richard Peck, A Year Down Yonder
2 : to supply with gas Gas up the car.


\ ˈgas How to pronounce gas (audio) \
plural gases also gasses

Medical Definition of gas

 (Entry 1 of 3)

1 : a fluid (as air) that has neither independent shape nor volume but tends to expand indefinitely
2 : a gaseous product of digestion also : discomfort from this
3 : a gas or gaseous mixture used to produce anesthesia
4 : a substance that can be used to produce a poisonous, asphyxiating, or irritant atmosphere
gassed; gassing

Medical Definition of gas (Entry 2 of 3)

1 : to treat chemically with gas
2 : to poison or otherwise affect adversely with gas

Medical Definition of GAS (Entry 3 of 3)

general adaptation syndrome

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More from Merriam-Webster on gas

Rhyming Dictionary: Words that rhyme with gas

Thesaurus: All synonyms and antonyms for gas

Spanish Central: Translation of gas

Nglish: Translation of gas for Spanish Speakers

Britannica English: Translation of gas for Arabic Speakers Encyclopedia article about gas

Comments on gas

What made you want to look up gas? Please tell us where you read or heard it (including the quote, if possible).


to make a temporary encampment

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