1. Rising toward the zenith; above the horizon. The constellation . . . About that time ascendant. (Browne)
2. Rising; ascending.
3. Superior; surpassing; ruling. An ascendant spirit over him. (South) The ascendant community obtained a surplus of wealth. (j. S. Mill) Without some power of persuading or confuting, of defending himself against accusations, . . . No man could possibly hold an ascendent position. (Grote)
Someone from whom you are descended (but usually more remote than a grandparent).