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| Date: | 1300-1400 |
| Origin: | dure 'to continue in existence' (13-19 centuries), from Old French durer, from Latin durare |
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dur‧ing S1 W1
1 from the beginning to the end of a period of time : 
During the summer she worked as a lifeguard.He slept calmly during the early part of the night. Foxes remain hidden during the day.
During the summer she worked as a lifeguard.He slept calmly during the early part of the night.Foxes remain hidden during the day.2 at some point in a period of time : My father was killed during the war. I mentioned the subject during our discussions at her Washington office.
My father was killed during the war.I mentioned the subject during our discussions at her Washington office. 
WORD CHOICE: during, while!! Do not say 'during doing something'. Say while doing something • While travelling to work, I saw an accident (NOT During travelling to work, I saw an accident).!! Do not say 'during someone does something'. Say while someone does something • He stole her money while she slept (NOT He stole her money during she slept).!! Do not say 'during someone is young/asleep etc'. Say while someone is young/asleep etc • It's best to get your teeth fixed while you're still young (NOT during you're still young).during, for, or since? See note at SINCEWORD CHOICE:
WORD CHOICE: since, for, during, overUse since to say that something started at a point in time in the past, and is still continuing • He has been living in Leeds since 1998. • We've known about it since May. Since is usually followed by a time expression ('last year', 'this morning', '4 o'clock' etc) or by the simple past tense. Use the present perfect or the past perfect in the other clause • I have loved movies since I first went to the cinema. • He had been seriously ill since Christmas.!! Speakers of British English usually say it is a long time/two weeks etc since..., and speakers of American English it has been a long time/two weeks etc since..., but both uses are correct • It's weeks (BrE)/It's been weeks (AmE) since I saw Grandma.Use for when you state the length of time that something has been happening • We have known each other for ten years (NOT since ten years). • I had been waiting for hours (NOT since hours). • I haven't seen him for ages (NOT since ages).During and over are used when you state the period of time in which something happens or changes • During her first year at college, she had several boyfriends. • Over the last six months, crime has doubled. ➔ See also since
