Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “day”

day

noun   /deɪ/
A1 a period of 24 hours: the days of the week I saw her the day before yesterday.
A2 the period during the day when there is light from the sun: a bright, sunny day
A2 the time that you usually spend at work or school: It’s been a very busy day at the office. I have a day off (= when I am not at work) tomorrow.
one day A2 used to talk about something that happened in the past: One day, I came home to find my windows smashed.
these days A2 used to talk about the present period of time: I don’t go out much these days.
for days B1 for a long time: I haven’t seen Jack for days.
one day/one of these days B1 used to talk about something you think will happen in the future: One of these days I’ll tell her what really happened.
the other day B1 a few days ago: I saw Terry in the bank the other day.
day after day every day for a long period of time: Day after day they marched through the mountains.
(Definition of day noun from the Cambridge Essential Dictionary © Cambridge University Press)

Definitions of “day” in other dictionaries

Word of the Day

altruistic

showing a wish to help or bring advantages to others, even if it results in disadvantage for yourself

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More