| Abbreviation | Definition |
|---|---|
| CMI | Clobber Monitor Immediate |
| CMP | Compare |
| CMPLX | Complex |
| CMPS | Compare String (Byte or Word) |
| CMPSB | Compare String Byte |
| CMPSD | Compare String Doubleword |
| CMPSW | Compare String Word |
| CNV | Convert |
| COCOA | Center Of Curvature Optical Assembly |
| COD | Crash On Demand |
| COESA | College of Education Student Assembly |
| COGUA | Church Of God of the Union Assembly |
| COMPUTER | Commonly operating machine programming useful technology electronic researh |
| CON | Call Operator Now |
| CORA | Computer Oral Response Activated |
| COZA | Commonwealth of Zion Assembly |
| CP | Compact Precision |
| CPA | Cut, Paste, Assemble |
| CPN | Call Programmer Names |
| CPR | Contents of Previous Register |