1a) the universe, the world
1b) the aerial heavens or sky, the region where the clouds and the tempests gather, and where thunder and lightning are produced
1c) the sidereal or starry heavens
2) the region above the sidereal heavens, the seat of order of things eternal and consummately perfect where God dwells and other heavenly beings
Perhaps from the same as G3735 (through the idea of elevation); the sky; by extension heaven (as the abode of God); by implication happiness, power, eternity; specifically the Gospel (Christianity)
KJV Usage: air, heaven ([-ly]), sky.