air

noun:the invisible gaseous substance surrounding the earth, a mixture mainly of oxygen and nitrogen
- The fresh air felt wonderful after being inside all day.
verb:to express an opinion or point of view publicly
- The senator used the interview to air his concerns about the new policy.
noun:a distinctive impression or quality conveyed by something; an atmosphere
- The old mansion had an air of mystery about it.
verb:to ventilate a space by allowing fresh air to circulate
- She opened the windows to air out the stuffy room.
noun:used to refer to the medium of television or radio
- The new show will be on the air next Tuesday.