erro - fail
- erroneous conditions
- erroneous operation
- error
- error alarm
- error amplifier
- error analysis
- error band of uncertainty
- error channel
- error circuit
- error code
- error compensation
- error compensator
- error component
- error condition
- error control
- error correction
- error correction circuit
- error corrector
- error counter
- error criterion
- error detecting code
- error detection
- error dynamics
- error fraction
- error handling procedure
- error indicating circuit
- error indication
- error light
- error limit
- error locating code
- error map
- error mapping
- error margin
- error matrix
- error message
- error meter
- error model of a machine
- error model of a single axis
- error motion
- error number
