Air Definition–noun | 1. | a mixture of nitrogen, oxygen, and minute amounts of other gases that surrounds the earth and forms its atmosphere. | | 2. | a stir in the atmosphere; a light breeze. | | 3. | overhead space; sky: The planes filled the air. | | 4. | circulation; publication; publicity: to give air to one's theories. | | 5. | the general character or complexion of anything; appearance: His early work had an air of freshness and originality. | | 6. | the peculiar look, appearance, and bearing of a person: There is an air of mystery about him. | | 7. | airs, affected or unnatural manner; manifestation of pride or vanity; assumed haughtiness: He acquired airs that were insufferable to his friends. | | 8. | Music. | b. | the soprano or treble part. | | d. | Also, ayre. an Elizabethan art song. | | | 9. | aircraft as a means of transportation: to arrive by air; to ship goods by air. | | 10. | Informal. air conditioning or an air-conditioning system: The price includes tires, radio, and air. | | 11. | Radio. the medium through which radio waves are transmitted. | –verb (used with object) | 13. | to expose to the air; give access to the open air; ventilate (often fol. by out): We air the bedrooms every day. | | 14. | to expose ostentatiously; bring to public notice; display: to air one's opinions; to air one's theories. | | 15. | to broadcast or televise. | –verb (used without object) | 16. | to be exposed to the open air (often fol. by out): Open the window and let the room air out. | | 17. | to be broadcast or televised. | –adjective | 18. | operating by means of air pressure or by acting upon air: an air drill; an air pump. | | 19. | of or pertaining to aircraft or to aviation: air industry. | | 20. | taking place in the air; aerial: air war. | —Idioms | 21. | clear the air, to eliminate dissension, ambiguity, or tension from a discussion, situation, etc.: The staff meeting was intended to help clear the air. | <
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/tr> | 22. | get the air, Informal. | a. | to be rejected, as by a lover. | | b. | to be dismissed, as by an employer: He had worked only a few days when he got the air. | | | 23. | give (someone) the air, Informal. | a. | to reject, as a lover: He was bitter because she gave him the air. | | b. | to dismiss, as an employee. | | | 24. | in the air, in circulation; current: There's a rumor in the air that we're moving to a new location. | | 25. | into thin air, completely out of sight or reach: He vanished into thin air. | | 26. | off the air, | a. | not broadcasting: The station goes off the air at midnight. | | b. | not broadcast; out of operation as a broadcast: The program went off the air years ago. | | c. | (of a computer) not in operation. | | | 27. | on the air, | a. | in the act of broadcasting; being broadcast: The program will be going on the air in a few seconds. | | b. | (of a computer) in operation. | | | 28. | put on airs, to assume an affected or haughty manner: As their fortune increased, they began to put on airs. | | 29. | take the air, | a. | to go out-of-doors; take a short walk or ride. | | b. | Slang. to leave, esp. hurriedly. | | c. | to begin broadcasting. | | | 30. | up in the air, | a. | Also, in the air. undecided or unsettled: The contract is still up in the air. | | b. | Informal. angry; perturbed: There is no need to get up in the air over a simple mistake. | | | 31. | walk or tread on air, to feel very happy; be elated. | From DictionaryCylinder Definition–noun 1. | Geometry. a surface or solid bounded by two parallel planes and generated by a straight line moving parallel to the given planes and tracing a curve bounded by the planes and lying in a plane perpendicular or oblique to the given planes. | | 2. | any cylinderlike object or part, whether solid or hollow. | | 3. | the rotating part of a revolver, containing the chambers for the cartridges. | | 4. | (in a pump) a cylindrical chamber in which a piston slides to move or compress a fluid. | | 5. | (in an engine) a cylindrical chamber in which the pressure of a gas or liquid moves a sliding piston. | | 6. | (in certain printing presses) | a. | a rotating cylinder that produces the impression and under which a flat form to be printed from passes. | | b. | either of two cylinders, one carrying a curved form or plate to be printed from, that rotate against each other in opposite directions. | | | 7. | (in certain locks) a cylindrical device for retaining the bolt until tumblers have been pushed out of its way. | | 8. | (in a screw or cylindrical gear) an imaginary cylindrical form, concentric to the axis, defining the pitch or the inner or outer ends of the threads or teeth. | | 9. | Computers. the tracks of a magnetic disk that are accessible from a single radial position of the access mechanism. | | 10. | Textiles. the main roller on a carding machine, esp. the roller covered with card clothing that works in combination with the worker and stripper rollers in carding fibers. | | 11. | Archaeology. a cylindrical or somewhat barrel-shaped stone or clay object bearing a cuneiform inscription or a carved design, worn by the Babylonians, Assyrians, and kindred peoples as a seal and amulet. | –verb (used with object) | 12. | to furnish with a cylinder or cylinders. | | 13. | to subject to the action of a cylinder or cylinders. | |
From DictionaryRelated topics from Britannicapiston and cylinder
in mechanical engineering, sliding cylinder with a closed head (the piston) that is moved reciprocally in a slightly larger cylindrical chamber (the cylinder) by or against pressure of a fluid, as in ...
air brake
either of two kinds of braking systems. The first, used by railroad trains, trucks, and buses, operates by a piston driven by compressed air from reservoirs connected to brake cylinders. When air ...
air gun
weapon based on the principle of the primitive blowgun that shoots bullets, pellets, or darts by expansion of compressed air.air lock
device that permits passage between regions of differing air pressures, most often used for passage between atmospheric pressure and chambers in which the air is compressed, such as pneumatic ...
lighthouse
About the beginning of the 20th century, compressed-air fog signals, which sounded a series of blasts, were developed. The most widely used were the siren and the diaphone. The siren consisted of a ...
flight, history of
During World War I several farsighted European entrepreneurs, emboldened by wartime progress in aviation, envisioned the possibilities of postwar airline travel. For many months after the war, normal ...
octane number
measure of the ability of a fuel to resist knocking when ignited in a mixture with air in the cylinder of an internal-combustion engine. The octane number is determined by comparing, under standard ...
fuel injection
in an internal-combustion engine, introduction of fuel into the cylinders by means of a pump rather than by the suction created by the movement of the pistons. Diesel engines do not use spark plugs ...
petroleum refining
The principal end use of gas oil is as diesel fuel for powering automobile, truck, bus, and railway engines. In a diesel engine, combustion is induced by the heat of compression of the air in the ...
diesel engine
One objectionable feature of the full diesel was the necessity of a high-pressure, injection air compressor. Not only was energy required to drive the air compressor, but a refrigerating effect that ...
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