It was communicated with the air of a secret.
Pope.
12. pl. An artificial or affected manner; show of pride or vanity; haughtiness; as, it is said of a person, he puts on airs. Thackeray.
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14. (Paint.) (a) The representation or reproduction of the effect of the atmospheric medium through which every object in nature is viewed. New Am. Cyc. (b) Carriage; attitude; action; movement; as, the head of that portrait has a good air. Fairholt.