Real Dictionary

heaven
proper noun: In some religions, heaven is said to be the place where God lives, where good people go when they die, and where everyone is always happy. It is usually imagined as being high up in the sky.
uncountable noun: You can use heaven to refer to a place or situation that you like very much.

heaven in American English
the space surrounding or seeming to overarch the earth, in which the sun, moon, and stars appear; visible sky; firmament
noun: the abode of God, the angels, and the spirits of the righteous after death; the place or state of existence of the blessed after the mortal life