–adjective

1.	ope e4 rating under the direct control of, or connected to, a main computer.

2.	connected by computer to one or more other computers or networks, as through a7d a commercial electronic information service or the Internet.

3.	of or denoting a business that transmits electronic information over telecommunications lines: an on-line bookstore.

4.	available or operating on a computer or computer network: an on-line dictionary.

5.	by means of or using a computer: on-line shopping.

6.	Radio. (of a network) supplying affiliated stations with all or a substantial part of their programming.

7.	Television. of or pertaining to the final editing of a videotaped program.

8.	done or accomplished while in operation or active service: on-line maintenance.

9.	located on major routes or rail lines: on-line industries.

–adverb

10.	with or through a computer, esp. over a network.

–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. a. a tune; melody. b. the soprano or treble part. c. an aria. 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.

12.	Archaic. breath.

–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 ostentatio 5ae usly; 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, s 1992 ituation, 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.

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.

–verb (used without object)

1.	to go from one place to another, as by car, train, plane, or ship; take a trip; journey: to travel for pleasure.

2.	to move or go from one place or point to another.

3.	to proceed or advance in any way.

4.	to go from place to place as a representative of a business firm.

5.	to associate or consort: He travels in a wealthy crowd.

6.	Informal. to move with speed.

7.	to pass, or be transmitted, as light or sound.

8.	Basketball. 3e8 walk (def. 9).

9.	to move in a fixed course, as a piece of mechanism.

–verb (used with object)

10.	to travel, journey, or pass through or over, as a country or road.

11.	to journey or traverse (a specified distance): We traveled a hundred miles.

12.	to cause to journey; ship: to travel logs downriver.

–noun

13.	the act of traveling; journe 5af ying, esp. to distant places: to travel to other planets.

14.	travels, a. journeys; wanderings: to set out on one's travels. b. journeys as the subject of a written account or literary work: a book of travels. c. such an account or work.

15.	the coming and going of persons or conveyances along a way of passage; traffic: an increase in travel on state roads.

16.	Machinery. a. the complete movement of a moving part, esp. a reciprocating part, in one direction, or the distance traversed; stroke. b. length of stroke.

17.	movement or passage in general: to reduce the travel of food from kitchen to table.

–adjective

18.	used or designed for use while traveling: a travel alarm clock.