extension world:

Spengler here refers to the world of perception, the world that the individual sees, hears, feels but cannot control; objective reality beyond the self.

 

inexorable:

unyielding; unalterable;  inexorable truth; inexorable justice; not to be persuaded, moved, or affected by prayers or entreaties.

delimitation:

to fix or mark the limits or boundaries of; demarcate.

Moorish mosques: * see Endnote 59

Great Mosque of Córdoba, Spain; the structure is regarded as one of the most accomplished monuments of Moorish architecture.  In 784 AD Abd al-Rahman I ordered construction of the Great Mosque, which was considerably expanded by later Muslim rulers.