| Abbreviation | Definition |
|---|---|
| CMVSS | Canada Motor Vehicle Safety Standards |
| CMVSS | Canadian Motor Vehicle Safety Standard |
| CMVT | Commercial Motor Vehicle Tax |
| CN | Canadian National |
| CNF | Cargo and Freight |
| CNF | Chomsky Normal Form |
| CNG | Compressed Natural Gas |
| CNS | Communications, Navigation and Surveillance |
| CNTP | Campaign for New Transportation Priorities |
| CNV | Conversion Van |
| CNX | The flight has a connection; change of planes |
| CO | Carbon Monoxide |
| CO | Change Over |
| CO2 | Carbon Dioxide |
| COB | Clean On Board |
| COD | Carrier Onboard Delivery |
| CODAS | Consolidated Operations and Delay Analysis System |
| COE | Cab Over Engine |
| COF | Cost of Freight |
| COG | Chain Over Gear |