Webster's 1828 Dictionary
ORTIVE
a.[L. ortivus, from ortus, orior, to rise. ] Rising, or eastern. The ortive amplitude of a planet is an arc of the horizon intercepted between the point where a star rises, and the east point of the horizon, the point where the horizon and equator intersect.
Webster's 1913 Dictionary
ORTIVE
Or "tive, a. Etym: [L. ortivus, fr. oriri, ortus, to rise: cf. F.ortive. ]
Defn: Of or relating to the time or act of rising; eastern; as, the ortive amplitude of a planet.
The Wordsmith Dictionary