[countable] [usually singular] the period of time when you are awake and doing things
every day: You should try to go for a walk every day.
all day (long): What do you do at home all day?
a bad/hard/long day (=a difficult or unpleasant day): She came home exhausted after a hard day at the office.
a day off (=a day when you do not work): I’ve got a day off next week.
a day out (=a day when you go out somewhere for fun or enjoyment): All children enjoy a day out at the fair.
Synonyms and related words