 “Form” acquires a broad sense for Avempace who distinguishes various kinds of it. Forms are known as the intelligible essences of objects. Avempace accepts this meaning. For him, however, forms have something in common, namely, moving power, and forms are integrated into a participating hierarchy. Avempace’s doctrine of the forms is no doubt original, although antecedents are found in the Neo-Platonist tradition. He once quotes a treatise “On the Spiritual Forms” misattributed to Alexander of Aphrodisias (IB-coll-fakhry: 166. 16–17; IB-CIM: 18) which S. Pines (1955) demonstrated to belong to Proclus. Alfarabi’s Risala fi l-‛aql (1938) and other of his works contain the principles of the participating hierarchy of intellects and intelligibles (cf. Davidson 1992; Ramón Guerrero 1992).