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atm. (pressure unit)


a unit of pressure: the pressure that will support a column of mercury 760 millimeters high at sea level and 0 degrees Celsius


quantity noun (quantities and units of measure)


(* atm. may be used in a singular or plural context)

Original source:

Princeton WordNet


atmosphere | standard atmosphere | standard pressure | atm [abbreviation]


automated teller machine
(Source: New World Dictionary)  [more]

All senses of atm....

Definition references  (+images)

Britannica Encyclopedia:

standard atmosphere [atmospheric model]

atmospheric model with a given vertical distribution of temperature, pressure, and humidity, which by international agreement is taken as a worldwide ... (21 of 158 words)


standard atmosphere [unit of measurement]

unit of pressure, equal to the mean atmospheric pressure at sea level. It corresponds to the pressure exerted by a vertical column of mercury 760 mm ... (26 of 67 words)



Standard atmosphere [disambiguation]

may refer to: A standard reference value for air pressure: Atmosphere (unit), an approximation of the value at sea level | Atmospheric pressure, other reference values | A model of how atmospheric pressure varies with altitude: The U.S. Standard ... (37 of 127 words, 7 definitions)

en​.wikipedia​.org​/wiki​/Standard atmosphere

Random House Dictionary:

standard atmosphere

an arbitrarily determined vertical distribution of atmospheric pressure, ... | a standard unit of atmospheric pressure, having a value of 1013.2 ... (20 of 55 words, 2 definitions)


Columbia Encyclopedia:

STP | standard temperature and pressure | standard pressure | standard temperature

standard conditions for measurement of the properties of matter. The standard temperature is the freezing point of pure water, 0°C or 273.15K. The ... (23 of 115 words)


American Heritage Dictionary:

atmosphere | atm [abbreviation, sense-specific]

The gaseous mass or envelope surrounding a celestial body, especially the ... | The air or climate in a specific place. | [physics] A unit of pressure ... (25 of 158 words, 6 definitions, 2 usage examples, pronunciation, 1 image)


New World Dictionary:

atmosphere | atm [abbreviation, sense-specific]

the gaseous envelope (air) surrounding the earth to a height of about 1,000 ... | the gaseous mass surrounding any star, planet, etc. | the air in any ... (26 of 147 words, 7 definitions, 2 usage examples, pronunciation, 1 image)


Collins Dictionary:

atmosphere | at [abbreviation, sense-specific] | atm [abbreviation, sense-specific] | atmospheric [derived] | atmospherical [adjective, derived]

the gaseous envelope surrounding the earth or any other celestial body "troposphere", "stratosphere", "mesosphere", "ionosphere" | the air or climate ... (19 of 595 words, 7 definitions, 12 usage examples, pronunciation)



atmosphere | air [synonym, sense-specific] | ambience [synonym, sense-specific] | aroma [synonym, sense-specific] | aura [synonym, sense-specific] | climate [synonym, sense-specific] | flavor [synonym, sense-specific] | halo [synonym, sense-specific] | karma [synonym, sense-specific] | ...

the gaseous envelope of a celestial body (as a planet) ; the whole mass of air surrounding the earth | the air of a locality | a surrounding influence ... (27 of 219 words, 5 definitions, 2 usage examples, pronunciations)


Oxford Dictionary:

atmosphere | atm [abbreviation]

Syllabification: (at·mos·phere) | [singular] : the envelope of gases surrounding the earth or another planet | the air in any particular place | ... (20 of 141 words, 6 definitions, 5 usage examples, pronunciation)

oxforddictionaries​.com​/definition​/american english​/atmosphere

atmosphere [singular] | atm [abbreviation]

the envelope of gases surrounding the earth or another planet | the air in any particular place | [physics] : a unit of pressure equal to mean ... (25 of 127 words, 5 definitions, 4 usage examples, pronunciation)


Macmillan British Dictionary:

atmosphere | atmospheres [plural]

[countable] the air round the Earth or round another planet | [singular] the air inside a room or other place | [singular] the mood or feeling that ... (25 of 121 words, 4 definitions, 5 usage examples, pronunciation)


Cambridge Dictionary:

atmosphere [entry 1] | the atmosphere

"the atmosphere": [singular] the mixture of gases around the Earth | [singular] the air that you breathe in a place | the mixture of gases that ... (24 of 70 words, 3 definitions, 3 usage examples, pronunciations)

dictionary​.cambridge​.org​/dictionary​/british​/atmosphere 1

atmosphere [entry 2]

[singular] the character, feeling or mood of a place or situation | [approving] a feeling that a place has of being pleasant and interesting or ... (24 of 94 words, 2 definitions, 4 usage examples, pronunciations)

dictionary​.cambridge​.org​/dictionary​/british​/atmosphere 2


atmosphere | atmospheres [plural] | atmosphære [archaic, sense-specific] | air [synonym, sense-specific] | ambiance [synonym, sense-specific] | feeling [synonym, sense-specific] | mood [synonym, sense-specific]

The gases surrounding the Earth or any astronomical body. | The air in a particular place. | The mood or feeling in a situation. | A unit of measurement for pressure (symbol: atm) (30 of 46 words, 4 definitions, pronunciations)


Encarta Dictionary:

atmosphere | atmospheres [plural] | standard atmosphere [measurements, sense-specific]

the mixture of gases that surrounds an astronomical object such as the Earth | the air or climate in a given place | a prevailing emotional tone or ... (26 of 150 words, 6 definitions, pronunciation)

encarta​.msn​.com​/dictionary 1861587522​/definition​.html  [offline]

Etymology reference

New World Dictionary:


Origin: automated teller machine


Audio references

Google Dictionary:


Audio: English pronunciation of "atm"


YourDictionary Audio:


Audio: North American English pronunciation of "atm" by speech synthesizer


Page last updated: 2013-06-26

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