The interval between consecutive high tides at a given place.

(archaic) The days following the heliacal rising of Sirius, now in early August (Gregorian) at dates varying by latitude. / The unpleasantly hot days of late summer.

(military) A day for manoeuvres and tactical exercises in "the field". / A school day for athletic events; a sports day. / A day of class taken away from school for a field trip.

(figuratively) The date of any major event planned for the future.

Lasting throughout the whole day. / Available throughout the whole day.

(idiomatic, abstractly) Healthy eating and living using traditional temperate-zone fresh foods.

(historical) 6 June 1944, the date when the Allies invaded western Europe in World War II.

(astronomy) one day of solar time, the time between successive noons; the time in which a planet such as Earth apparently rotates once around its axis, relative to the sun (on Earth about 24 hours as an average - the length of solar day is not constant throughout the year)

Used other than figuratively or idiomatically: see market, day. / The day of the week in which a market is held in some particular location.

(Canada) A holiday, originally to give thanks to God for the harvest, celebrated annually on the second Monday of October.