Glossed in 3 editions — when this term was part of the working vocabulary. First defined in 93th Edition.
How the definition evolved (4 versions)
93th Reduced Instruction Set Computer, Version 5 (an open standard instruction set architecture)
98th Reduced Instruction Set Computer-V (open standard instruction set architecture)
151th An open-source instruction set architecture for chip design, enabling hardware development outside the proprietary ecosystems controlled by Intel, ARM, and their licensees