A parallel computer whose processors' main memory is physically separated from each others -- contrast with shared memory
Computer memory that is physically distributed among several processors that are connected by an interprocessor communications network. Each processor can only address its local memory, so data in other processors' memories must be transferred by interprocess communication.
Memory that is physically distributed among several modules. A distributed-memory architecture may appear to users to have a single address space and a single shared memory or may appear as disjoint memory made up of many separate address spaces.