dure 'to continue in existence' (13-19 centuries), from Old French durer, from Latin durare
1from 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.
2at 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.
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. Sinceis 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 forwhen 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 overare 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 alsosince
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.