| Abbreviation | Definition |
|---|---|
| PCM | Pulse Code Modulation |
| PCM | Personal Challenge Manager |
| PCM | Primary Care Manager |
| PCM | Punch Card Machine |
| PCM | Pulse Code Modulator |
| PCM | Power Control Mission |
| PCM | Pulse-Code Modulation |
| PCM | Phase-Change Memory |
| PCM | Plug Compatible Module |
| PCMCIA | Personal Computer Memory Card International Association |
| PCMDI | Program for Climate Model Diagnosis and Intercomparison |
| PCME | Pulse-Code Modulation Event |
| PCMMU | Pulse-Code Modulation Master Unit |
| PCMMU | PCM Master Unit |
| PCMS | Pulse-Code Modulation Shared |
| PCN | Program Control Number |
| PCN | Program Change Notice |
| PCN | Page Change Notice |
| PCO | Provisional Constitutional Order |
| PCO | Professional Conference Organiser |
| PCO | Precinct Committee Officer |
| PCO | Prospective Commanding Officer |
| PCO | Pest Control Operator |
| PCO | Program Controlled Output |
| PCO | Procuring Contracting Officer |
| PCO | Postcheckout Operations |
| PCO | Project Coordinating Office |
| PCO | Principal Contracting Officer |
| PCO | Procuring Contracting Office |
| PCOS | Poly-Cystic Ovarian Syndrome |
| PCOS | Pediatric Cancer Research |
| PCOT | Payload Center Operations Team |
| PCP | Primary Care Provider |
| PCP | Payroll Compliance Practitioner |
| PCP | Project Cost Plan |
| PCP | Project Change Proposal |
| PCP | Program Change Proposal |
| PCP | Power Control Panel |
| PCQ | Position Classification Questionnaire |
| PCR | Pediatric Cancer Research |
| PCR | Publication Change Request |
| PCR | Project Control Room |
| PCR | Program Change Request |
| PCR | Power Change Request |
| PCR | Payload Checkout Room |
| PCR | Payload Changeout Room |
| PCR | Payload Certification Review |
| PCRA | Petroleum Conservation Research Association |
| PCRB | Program Change Review Board |
| PCRF | Pediatric Cancer Research Foundation |