Military expansion. The Rashidun Caliphate expanded gradually; within the span of 24 years of conquest, a vast territory was conquered comprising Mesopotamia, the Levant, parts of Anatolia, and most of the Sasanian Empire. Unlike the Sasanian Persians, the Byzantines, after losing Syria, retreated back to Anatolia.
1 And the nature of this reality again can neither be consistently represented as a fixed and hard substance nor as an unalterable something, but only as a fixed order of recurrence of continually changing events or impressions.
Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  persistent, relentless, unrelenting(adj) never-ceasing. the relentless beat of the drums. 2  haunting, persistent(adj) continually recurring to the mind. haunting memories; the cathedral organ and the distant voices have a haunting beauty- Claudia Cassidy.