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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. |
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| 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) <
dc5
/span>| 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. |
| 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. |
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| 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. |
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| 24. | in the air, in circulation; current: There's a rumor in the air that we're moving to a new location. |
| 25. | <
138
td valign="top">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. |
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| 27. | on the a
e53
ir, | 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. |
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| 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. |
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| 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. |
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| 31. | walk or tread on air, to feel very happy; be elated. |
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From Dictionary
Filter Definition–noun | 1. | any substance, as cloth, paper, porous porcelain, or a layer of charcoal or sand, through which liquid or gas is passed to remove suspended impurities or to recover solids. |
| 2. | any device, as a tank or tube, containing such a substance for filtering. |
| 3. | any of various analogous devices, as for removing dust from air or impurities from tobacco smoke, or for eliminating certain kinds of light rays. |
| 4. | Informal. a filter-tipped cigarette or cigar. |
| 5. | Photography. a lens screen of dyed gelatin or glass for controlling the rendering of color or for diminishing the intensity of light. |
| 6. | Electronics, Physics. a circuit or device that passes certain frequencies and blocks others. |
| 7. | Mathematics. a collection of subsets of a topological space, having the properties that the intersection of two subsets in the collection is a subset in the collection and that any set containing a subset in the collection is in the collection. |
–verb (used with object) | 8. | to remove by the action of a filter. |
| 9. | to act as a filter for; to slow or partially obstruct the passage of: The thick leaves filtered the sunlight. |
| 10. | to pass through or as through a filter. |
–verb (used without object) | 11. | to pass or slip through slowly, as through an obstruction or a filter: Enemy agents managed to filter into the embattled country. |
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From Dictionary
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One of the most efficient devices for removing suspended particulates is an assembly of fabric filter bags, commonly called a baghouse. A typical baghouse (see ) comprises an array of long, narrow ...
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heating
Because of its low density, air carries less heat for shorter distances than do hot water or steam. The use of air as the primary heat conveyor is nevertheless the rule in American homes and offices, ...
The Environment
A report by the World Wide Fund for Nature, published in July, found that more than half the prime nature reserves in Europe were being damaged by acid rain. The most seriously affected area, where ...
foamed plastic
synthetic resin converted into a spongelike mass with a closed-cell or open-cell structure, either of which may be flexible or rigid, used for a variety of products including cushioning materials, ...
Columbia
city, seat of Boone county, near the Missouri River, central Missouri, U.S., midway between St. Louis and Kansas City. It was originally established (1819) as Smithton, but an inadequate water supply ...
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city, Summit county, northeastern Ohio, U.S., just northeast of Akron, on the Cuyahoga River. Cuyahoga, possibly meaning "crooked water," was the name given by the Iroquois Indians to the river. ...
The Environment
In its annual Toxic Release Inventory, published in April, the Environmental Protection Agency (EPA) reported that two-thirds of the over 3.5 billion kg (1 kg=2.2 lb) of toxic chemicals released into ...
spider
Spiders that use silk to capture prey utilize various techniques. Ground-dwelling trap-door spiders construct silk-lined tubes, sometimes with silk trapdoors, from which they dart out to capture ...
Honeywell International Inc.
American advanced-technology company that manufactures aerospace and automotive products; residential, commercial, and industrial control systems; specialty chemicals and plastics; and engineered ...
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