Day - definition of day by The Free Dictionary day - the recurring hours when you are not sleeping (especially those when you are working); "my day began early this morning"; "it was a busy day on the stock exchange"; "she called it a day and went to bed"
DAY definition and meaning | Collins English Dictionary A day is one of the seven twenty-four hour periods of time in a week Day is the time when it is light, or the time when you are up and doing things The weather did not help; hot by day, cold at night 27 million working days are lost each year due to work accidents and sickness He arranged for me to go down to London one day a week