When?

era
a period marked by distinctive character or reckoned from a fixed point or event
 
wedding day
the day of a wedding
 
quadrennium
a period of four years
 
eighties
the time of life between 80 and 90
 
Independence Day
a legal holiday in the United States
 
zygotene
the second stage of the prophase of meiosis
 
early childhood
the early stage of growth or development
 
quinquennium
a period of five years
 
Decoration Day
legal holiday in the United States, last Monday in May; commemorates the members of the United States armed forces who were killed in war
 
New Year's Day
the first day of the year
 
phase of the moon
a time when the Moon presents a particular recurring appearance
 
multistage
occurring in more than one stage
 
Presidents' Day
the third Monday in February; commemorates both presidents Lincoln and Washington
 
school day
any day on which school is in session
 
major fast day
one of two major fast days on the Jewish calendar
 
bimester
a period of 2 months
 
Assumption of Mary
celebration in the Roman Catholic Church of the Virgin Mary's being taken up into heaven when her earthly life ended; corresponds to the Dormition in the Eastern Orthodox Church
 
Germinal
seventh month of the Revolutionary calendar (March and April); the month of buds
 
chapter
any distinct period in history or in a person's life
 
calendar month
one of the twelve divisions of the calendar year
 
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