multiprocessing
noun
mul·ti·pro·cess·ing ˌməl-tē-ˈprä-ˌse-siŋ 
-ˌtī-,
-ˈprō-,
-sə-siŋ
: the processing of several computer programs at the same time especially by a computer system with two or more processors sharing a single memory
multiprocessor
ˌməl-tē-ˈprä-ˌse-sər
noun -ˌtī-
-ˈprō-
-sə-sər
Example Sentences
Recent Examples on the Web The same low-memory scheduler is also available in a variant designed for symmetric multiprocessing systems with multiple processors running in parallel. 
Jacek Krywko, Ars Technica, 2 Oct. 2020
Jacek Krywko, Ars Technica, 2 Oct. 2020 Word History
First Known Use
1961, in the meaning defined above