When?
- Paleolithic Age
- second part of the Stone Age beginning about 750,000 to 500,000 years BC and lasting until the end of the last ice age about 8,500 years BC
- Lower Paleolithic
- the oldest part of the Paleolithic Age with the emergence of the hand ax; ended about 120,000 years ago
- first trimester
- time period extending from the first day of the last menstrual period through 12 weeks of gestation
- regency
- the period of time during which a regent governs
- Tuesday
- the third day of the week; the second working day
- Presidents' Day
- the third Monday in February; commemorates both presidents Lincoln and Washington
- Vendemiaire
- first month of the Revolutionary calendar (September and October); the month of the grape harvest
- incarnation
- time passed in a particular bodily form
- Eastertide
- the Easter season
- United Nations Day
- a day for celebrating the founding of the United Nations
- Iyyar
- the eighth month of the civil year; the second month of the ecclesiastical year (in April and May)
- Washington's Birthday
- the day on which George Washington is remembered
- field day
- (military) a day for military exercises and display
- St Martin's Day
- the feast of Saint Martin; a quarter day in Scotland
- age of consent
- the minimum age for marrying without parental consent or the minimum age for consensual sexual relations; intercourse at an earlier age can result in a charge of assault or statutory rape; the age differs in different states of the Union
- voting age
- the age at which a person is old enough to vote in public elections
- Easter Sunday
- the day (in March or April) on which the festival of Easter is celebrated
- Dhu'l-Qa'dah
- the eleventh month of the Islamic calendar
- Upper Paleolithic
- the time period during which only modern Homo sapiens was known to have existed; ended about 10,000 years BC
- Roman times
- the time period during which Rome dominated Europe
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