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AirEASTON'S
The atmosphere, as opposed to the higher regions of the sky (1 Thess. 4:17; Rev. 9:2; 16:17). This word occurs once as the rendering of the Hebrew ruah (Job 41:16); elsewhere it is the rendering of shamaiyim, usually translated “heavens.” The expression “to speak into the air” (1 Cor. 14:9) is a proverb denoting to speak in vain, as to “beat the air” (1 Cor. 9:26) denotes to labour in vain.
Easton's Illustrated Bible Dictionary, 3rd ed. (1897), public domain.