\ˈgas \
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

Keep scrolling for more

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.
See More

Recent Examples on the Web: Noun

Smith returned to the gas pumps about 10 minutes later as a passenger in another car. Andres Picon,, "Man flees police, crashes car in Manchester, N.H.," 10 July 2018 Security experts have long warned that gas pumps were vulnerable to hackers. Chris Morris, Fortune, "Hackers Have a New Favorite Target: Gas Stations," 9 July 2018 Independence Day is prime time for credit card skimmers to be placed at gas pumps, the Secret Service warned Tuesday. Tonya Alanez,, "Skimmer alert! Holiday travelers advised to pay cash for gas," 4 July 2018 In a matter of just a few months, Wawa has proposed not one, but two, suburban-style Super Wawa stores along the river, complete with gas pumps and generous amounts of parking. Inga Saffron,, "Let's not welcome a Wawa on Philadelphia's Delaware waterfront | Inga Saffron," 4 July 2018 Motorists about to pay at gas pumps ahead of the July 4 holiday should ask themselves a question, the Secret Service says: Could I get defrauded? Joshua Hafner, ajc, "Gas pump credit card skimmers set to steal ahead of July 4th travel, Secret Service warns," 3 July 2018 At the gas pump, these fees would hit everyone, including low-income residents. Hal Bernton, The Seattle Times, "Fight heats up over Washington state carbon ‘fee’ likely to make fall ballot," 2 July 2018 The fatal shooting allegedly was sparked by a short argument after Littlejohn's car almost backed over Barron, who was walking to the store from the gas pumps, according to court documents. Robert A. Cronkleton, kansascity, "Independence teen charged with murder in shooting of driver who nearly backed over him," 25 June 2018 Surveillance video showed a man at the gas pump break into the car before driving to the side of the gas station to pick someone up, KARK reported. Crystal Hill, miamiherald, "Man paid a waitress for his meal. She saw her name on the credit card, Arkansas police say," 19 June 2018

Recent Examples on the Web: Verb

Instead, the scientists found that the best explanation for the altered path would in fact be from out-gassing – the kinds of emissions that could theoretically produce the tail of a comet. Amina Khan,, "'Oumuamua, the mysterious visitor from outside the solar system, is a comet after all," 28 June 2018 Nurkic was gassed in the first quarter because of that activity, Stotts said. Andrew Greif,, "Blazers lose 8th consecutive playoff game: 7 takeaways from Portland's Game 2 loss to New Orleans," 18 Apr. 2018 Nakagawa and key members produced sarin at a cult compound and sprayed it from a van, in what was later regarded as an experiment for the subsequent subway gassing. Washington Post, "Cult leader executed for Japan sarin attacks still a mystery," 6 July 2018 But here is the use, the crossing of that red line that the previous administration set where innocent people are being gassed with weapons that the regime isn't supposed to have at all. Fox News, "Mixed media verdict on Syria bombing," 16 Apr. 2018 Hitler, who had served with German Jews in the war, spread the idea that Jews had been the enemy within, proposing that the German Army would have won had some of them been gassed to death. Timothy Snyder, New York Times, "How Did the Nazis Gain Power in Germany?," 14 June 2018 He was gassed and wounded on June 12, according to a small pocket diary his descendants keep as a memento. Virginia Mayo,, "Marines’ bravery celebrated 100 years after French battle," 27 May 2018 Bashar al-Assad has bombed, gassed and starved his enemies out of the biggest cities. The Economist, "Syrian refugees could turn into the new Palestinians," 30 June 2018 Both Halep and Cahill thought Stephens looked a little gassed. Howard Fendrich, The Seattle Times, "4th time’s the charm: Halep tops Stephens to win French Open," 9 June 2018

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.

See More

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

Keep scrolling for more

Learn More about gas

Dictionary Entries near gas






gas attack


Statistics for gas

Last Updated

8 Nov 2018

Look-up Popularity

Time Traveler for gas

The first known use of gas was in 1779

See more words from the same year

Keep scrolling for more

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

: 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

: to put gasoline in (a car, truck, etc.)


\ˈgas \
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 \
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

Keep scrolling for more

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).


playful or foolish behavior

Get Word of the Day daily email!

Test Your Vocabulary

Autumn Words of the Day 2018

  • a-top-down-image-of-road-through-an-autumn-forest
  • Which is a synonym of fugacious?
True or False

Test your knowledge - and maybe learn something along the way.

Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!