day Meaning in the Cambridge English Dictionary
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Meaning of “day” in the English Dictionary

"day" in British English

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daynoun [C]

uk   us   /deɪ/
A1 a ​period of 24 ​hours, ​especially from twelve o'clock one ​night to twelve o'clock the next ​night: January has 31 days. the days of the ​week He ​runs five ​miles every day. It took us ​almost a day to get here. I ​saw him the day before ​yesterday. We ​leave the day after ​tomorrow. He was last ​seenalive five days ago. They haven't been ​seen for days (= for several days). I'll be ​seeing Pat in a few days/in a few days'time. How's ​your day been? (= Have you ​enjoyed today?) Have a ​nice day! I must get some ​sleep - I've got a ​big day (= an ​important day)tomorrow.A2 used to refer to the ​period in 24 ​hours when it is ​naturallylight: a ​brightsunny day It ​rained all day. These ​animalssleep during the day and ​hunt at ​night.A2 the ​time that you usually ​spend at ​work or at ​school: a ​normalworking day I ​work a seven-hour day. We're having to ​work a six-day ​week to ​cope with ​demand.day off a day when you do not have to ​work or do something that you ​normally do: I won't be in on ​Thursday - it's my day off. She's taking three days off next ​week.the other day B1 a few days ago: Didn't I ​see you in the ​postoffice the other day?these days A2 used to ​talk about the ​presenttime, in ​comparison with the past: Vegetarianism is very ​popular these days.in those days B2 in the past: In those days ​people used to write a lot more ​letters.any day now B2 very ​soon, ​especially within the next few days: The baby's ​due any day now.by day when it is ​naturallylight: I ​prefertravelling by day.day after day B1 repeatedly, every day: The same ​problemskeep coming up day after day.day and night all the ​time: You can ​hear the ​traffic from ​yourroom day and ​night.day by day B2 every day, or more and more as each day ​passes: Day by day he ​becameweaker.(from) day to day If something ​changes (from) day to day, it ​changes often: The ​symptoms of the ​diseasechange from day to day.from one day to the next before each day ​happens: I never ​know what I’ll be doing from one day to the next.the days C1 a ​period in ​history: How did ​peoplecommunicate in the days before ​email?to this day up to and ​including the ​presentmoment: To this day nobody ​knows what ​happened to him.
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(Definition of day from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"day" in American English

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daynoun [C]

 us   /deɪ/
a ​period of 24 ​hours, esp. from 12 o’clock one ​night to 12 o’clock the next ​night, or the ​part of this ​period after the ​sunrises but before it goes down, when there is ​light: My ​husbandpicks up ​ourson every day after ​school. In ​summer the days are ​longer and we have ​cookouts in the ​backyard. We ​leave on ​vacation the day after ​tomorrow. A day is also the ​part of a ​period of 24 ​hours that you ​spend at ​work: He’s been ​working 12-hour days this ​week. Days can ​mean a ​longperiod of ​time: In those days (= that ​period in ​history), ​people had ​largefamilies.
(Definition of day from the Cambridge Academic Content Dictionary © Cambridge University Press)
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