Synonyms for day

noun

1. The period of the earth's revolution

   twenty-four hours, mean solar day, sidereal day, time between sunrise and sunset, period from dawn to dark, solar day, nautical day, natural day, civil day, astronomical day, diurnal course, date.

2. The time of light or work

   daylight, daytime, broad daylight, full day, workday, working day, daylight hours, broadcast day, eight-hour day, union day; good, bad, hot, cold, damp, etc., day; sizzler*, scorcher*, good day for the races*.

3. A special day

   holiday, celebration, festival; see anniversary, holiday 1.

4. A period of time

   era, time, heyday, prime; see age 3.

call it a day*

from day to day