automatic operation
nounUK /ˌɔːtəˈmætɪk ˌɒpəˈreɪʃən/
US /ˌɔːtəˈmætɪk ˌɑːpəˈreɪʃən/
A machine doing its job all by itself without a person helping.
The automatic operation of the doors means you don't have to push them.
OTHER MEANINGS
2. A process that runs by itself in a computer or system without a person starting each step.
The backup is an automatic operation that happens every night.
3. The way a device works on its own after it is switched on.
The washing machine's automatic operation saves a lot of time.
4. A mode where a machine makes its own choices using sensors or software.
In automatic operation, the car keeps a safe distance from the car ahead.