These are the meanings of the letters RACI when you unscramble them.
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Air (n.)
The fluid which we breathe, and which surrounds the earth; the atmosphere. It is invisible, inodorous, insipid, transparent, compressible, elastic, and ponderable.
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Air (n.)
Symbolically: Something unsubstantial, light, or volatile.
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Air (n.)
A particular state of the atmosphere, as respects heat, cold, moisture, etc., or as affecting the sensations; as, a smoky air, a damp air, the morning air, etc.
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Air (n.)
Any aeriform body; a gas; as, oxygen was formerly called vital air.
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Air (n.)
Air in motion; a light breeze; a gentle wind.
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Air (n.)
Odoriferous or contaminated air.
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Air (n.)
That which surrounds and influences.
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Air (n.)
Utterance abroad; publicity; vent.
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Air (n.)
Intelligence; information.
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Air (n.)
A musical idea, or motive, rhythmically developed in consecutive single tones, so as to form a symmetrical and balanced whole, which may be sung by a single voice to the stanzas of a hymn or song, or even to plain prose, or played upon an instrument; a melody; a tune; an aria.
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Air (n.)
In harmonized chorals, psalmody, part songs, etc., the part which bears the tune or melody -- in modern harmony usually the upper part -- is sometimes called the air.
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Air (n.)
The peculiar look, appearance, and bearing of a person; mien; demeanor; as, the air of a youth; a heavy air; a lofty air.
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Air (n.)
Peculiar appearance; apparent character; semblance; manner; style.
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Air (n.)
An artificial or affected manner; show of pride or vanity; haughtiness; as, it is said of a person, he puts on airs.
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Air (n.)
The representation or reproduction of the effect of the atmospheric medium through which every object in nature is viewed.
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Air (n.)
Carriage; attitude; action; movement; as, the head of that portrait has a good air.
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Air (n.)
The artificial motion or carriage of a horse.
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Air (n.)
To expose to the air for the purpose of cooling, refreshing, or purifying; to ventilate; as, to air a room.
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Air (n.)
To expose for the sake of public notice; to display ostentatiously; as, to air one's opinion.
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Air (n.)
To expose to heat, for the purpose of expelling dampness, or of warming; as, to air linen; to air liquors.
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Arc (n.)
A portion of a curved line; as, the arc of a circle or of an ellipse.
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Arc (n.)
A curvature in the shape of a circular arc or an arch; as, the colored arc (the rainbow); the arc of Hadley's quadrant.
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Arc (n.)
An arch.
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Arc (n.)
The apparent arc described, above or below the horizon, by the sun or other celestial body. The diurnal arc is described during the daytime, the nocturnal arc during the night.
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Car (n.)
A small vehicle moved on wheels; usually, one having but two wheels and drawn by one horse; a cart.
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Car (n.)
A vehicle adapted to the rails of a railroad.
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Car (n.)
A chariot of war or of triumph; a vehicle of splendor, dignity, or solemnity.
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Car (n.)
The stars also called Charles's Wain, the Great Bear, or the Dipper.
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Car (n.)
The cage of a lift or elevator.
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Car (n.)
The basket, box, or cage suspended from a balloon to contain passengers, ballast, etc.
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Car (n.)
A floating perforated box for living fish.