1. • noun - a mixture of gases (especially oxygen) required for breathing
   • noun - the region above the ground
   • noun - a distinctive but intangible quality surrounding a person or thing
   • noun - a slight wind (usually refreshing)
   • noun - the mass of air surrounding the Earth
   • noun - once thought to be one of four elements composing the universe (Empedocles)
   • noun - a succession of notes forming a distinctive sequence
   • noun - medium for radio and television broadcasting
   • noun - travel via aircraft
   • verb - expose to fresh air
   • verb - be broadcast
   • verb - broadcast over the airwaves, as in radio or television
   • verb - make public
   • verb - expose to warm or heated air, so as to dry
   • verb - expose to cool or cold air so as to cool or freshen
2. • A colorless, odorless, tasteless, gaseous mixture, mainly nitrogen (approximately 78 percent) and oxygen (approximately 21 percent) with lesser amounts of argon, carbon dioxide, hydrogen, neon, helium, and other gases.
   • This mixture with varying amounts of moisture and particulate matter, enveloping Earth; the atmosphere.
   • The atmosphere in an enclosure.
   • The sky; the firmament.
   • A giant void; nothingness: The money vanished into thin air.
   • An atmospheric movement; a breeze or wind.
   • Aircraft: send troops to Europe by air.
   • Public utterance; vent: gave air to their grievances.
   • The electronic broadcast media: “often ridiculed... extremist groups on air” (Christian Science Monitor).
   • A peculiar or characteristic impression; an aura.
   • Personal bearing, appearance, or manner; mien.
   • Music.
   • The soprano or treble part in a harmonized composition.
   • A solo with or without accompaniment.
   • Air conditioning.
   • Often used to modify another noun: air movements; air safety.
   • To expose so that air can dry, cool, or freshen; ventilate.
   • See Synonyms at <A href="AHD3_V.
   • To be broadcast on television or radio: “tidbits that will air on tonight’s 6 o’clock news” (Terry Ann Knopf).
3. • adv - near the beginning of a period of time or a series of events
   • v - to expose to the air (the mixture of gases that surrounds the earth)

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