Concept:
The arch is a crucial structural innovation that allows loads to be distributed efficiently, enabling the construction of larger and more durable structures.
Explanation:
Although earlier civilizations experimented with primitive arches, the Romans are credited with developing and widely using the true arch as a major architectural element.
Roman mastery of the arch led to monumental structures such as aqueducts, bridges, amphitheatres, and basilicas.
Greek architecture relied mainly on post-and-lintel construction.
Egyptian architecture also used trabeated systems with massive stone blocks.
Mesopotamian civilizations used basic arches, but did not develop them to the structural and architectural sophistication achieved by the Romans.
Hence, the ancient civilization credited with inventing and perfecting the arch in architecture is the Roman civilization.
Final Answer: \(\boxed{\text{Roman}}\)