The vault of the heavens, where the clouds, sun, moon, and stars can be seen; the heavens, the sky.
In the geocentric Ptolemaic system, the eighth celestial sphere which carried the fixed stars; (countable, by extension) any celestial sphere.
The abode of God and the angels; heaven.
The field or sphere of an activity or interest.
The distant sky of the sun, moon, and stars.
An expression of surprise, contempt, outrage, disgust, boredom, or frustration.