Definition of ortive in English:

ortive

Pronunciation /ˈɔːtɪv/

adjective

Astronomy
  • Of or relating to the rising of a celestial object. Usually in "ortive amplitude": the angular distance of an object at its rising measured from the eastern point of the horizon.

Origin

Mid 17th century; earliest use found in Henry Gellibrand (1597–1637), mathematician. From classical Latin ortīvus relating to rising (1st century a.d. in astronomical context) from ortus rising, rise (from orīrī to rise + -tus, suffix forming verbal nouns) + -īvus.