Proceeding upward; rising; mounting.Superior; predominant; surpassing: as, “an ascendant spirit over him,” South.In astrology, rising over the horizon, or nearly so.In botany, same as ascending.In heraldry, rising or issuing upward (the reverse of issuant): as, rays of the sun ascendant from the bottom of the shield, from a fesse, etc.n. In astrology, the point of the ecliptic or the sign of the zodiac that is situated on the eastern horizon at any particular moment, as at the moment of birth or of the propounding of any question; the horoscope.n. Superiority or commanding influence; predominance: especially in the phrase to gain the ascendant over one.n. An ancestor, or one who precedes in genealogy or degrees of kindred: opposed to descendant.n. In architecture, one of the two sides or vertical members of the chambranle of a door or window.