to consistency in data stored in local cache memory and

Briefly, cache coherency refers to consistency in data stored in local cache memory and shared cache memory.

the discipline that ensures that the changes in the values of shared operands (data) are propagated throughout the system in a timely fashion

Cache coherence is the discipline which ensures that the changes in the values of shared operands (data) are propagated throughout the system in a timely fashion.

The consistency or regularity of data stored in the cache memory

The consistency or regularity of data stored in the cache memory is called cache coherence.

a special case of memory coherence

Cache coherence is a special case of memory coherence.