The midst or middle of heaven or the sky.

The meridian, or middle line of the heavens; the point of the ecliptic on the meridian.

this is the sign, and degree of that sign, on the cusp of the tenth house of the natal chart. it is the highest point in the zodiac at the moment of birth, and in relationship to the place of birth. abbreviation: MC

One of the four mundane points in the chart, the midheaven is located at the highest point overhead; the cusp of the 10th house. See Horoscope Angles