Zenith

1. n. hence, figuratively, the point of culmination; the greatest height; the height of success or prosperity.
2. n. That point in the visible celestial hemisphere which is vertical to the spectator; the point of the heavens directly overhead; — opposed to nadir.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.