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(Astronomy) See day1
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|Noun||1.||calendar day - a day reckoned from midnight to midnight|
period, period of time, time period - an amount of time; "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period"
day - a day assigned to a particular purpose or observance; "Mother's Day"
date - the particular day, month, or year (usually according to the Gregorian calendar) that an event occurred; "he tried to memorizes all the dates for his history class"
day of the week - any one of the seven days in a week