the GNU version of the Collaborative International Dictionary of English
n. The midst or middle of heaven or the sky.
n. The meridian, or middle line of the heavens; the point of the ecliptic on the meridian.
The Century Dictionary and Cyclopedia
n. The middle of the sky or of heaven.
n. In astronomy, the meridian of a place.
n. In astrology, the degree culminating on the cusp of the tenth house.
Word Usage
""Then I looked, and I heard an eagle flying in midheaven, saying with a loud voice, 'Woe, woe, woe to those who dwell on the earth, because of the remaining blasts of the trumpet of the tree angels who are about to sound.'""