During (preposition)

1. At some point in the time of (an event or period).
2. Throughout the duration of (an event or period).
3. In the course of (an event or period).
4. Throughout the time that (something) is happening.

Origin:

Middle english, from old english duru, durian, from duru "firm, hard" (in the sense "continuing without interruptio.n")

Examples:

1. I will call you during the meeting.
2. She was away during the summer.
3. He was studying during the night.
4. They were traveling during the winter.
5. We were working during the holidays.