Intentiones. For intentio meaning idea, see B. I, Chap. LIII. The reference is to archetypal ideas of creation, something akin to the Platonic Ideas, the "multitude of things intelligible," discussed in Chap. L-LV of this book. The 'Saracen jurists' (Saracenorum in jure loquentium) are apparently Avicenna and his school, against whom these chapters are directed.
Of God and His Creatures: 1.23