Learner's definition of DURING
1 : throughout the entire time of (an event, period, occurrence, etc.)
She swims every day during the summer.
We got along well during the trip.
He worked in the field during most of the day.
2 : at some time in the course of (something)
You can call me during the day. [=at some time in the day]
During the interview, they asked about my previous jobs.
The fire alarm went off during the ceremony.