Current; of the present. / (informal) Designating a present-day version of someone or something in history.

(idiomatic) An excursion, returning home on the same day.

(skiing) A day of skiing purchased in a ski area, used to measure the number of skiers in any one particular ski area. A season pass is generally considered to be twenty (20) skier days.

plural of leap day

A measure of heating or cooling, computed as the integral of a function of time that generally varies with temperature.

plural of degree day

plural of man-day

(Roman Catholic Church) The Tuesday before Easter.

(Canada) A holiday commemorating the birthdays of Queen Victoria and the reigning monarch of Canada, falling on the last Monday before May 25.

(military) Abbreviation of mobilization day.