When?

March
the month following February and preceding April
 
Christmas Day
a Christian holiday celebrating the birth of Christ; a quarter day in England, Wales, and Ireland
 
telophase
the final stage of meiosis when the chromosomes move toward opposite ends of the nuclear spindle
 
Presidents' Day
the third Monday in February; commemorates both presidents Lincoln and Washington
 
quinquennium
a period of five years
 
mid-March
the middle part of March
 
life
the period from the present until death
 
summertime
the warmest season of the year; in the northern hemisphere it extends from the summer solstice to the autumnal equinox
 
Low Sunday
the Sunday following Easter
 
market day
a fixed day for holding a public market
 
Industrial Revolution
the transformation from an agricultural to an industrial nation
 
school day
any day on which school is in session
 
midafternoon
the middle part of the afternoon
 
downtime
a period of time when something (as a machine or factory) is not operating (especially as a result of malfunctions)
 
Day of Atonement
(Judaism) a solemn and major fast day on the Jewish calendar; 10th of Tishri; its observance is one of the requirements of the Mosaic law
 
tiebreaker
overtime play in order to break a tie; e.g. tennis and soccer
 
rag day
a day on which university students hold a rag
 
window
the time period that is considered best for starting or finishing something
 
schooldays
the time of life when you are going to school
 
holy day of obligation
a day when Catholics must attend Mass and refrain from servile work, and Episcopalians must take Communion
 
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