When?
- 1770s
- the decade from 1770 to 1779
- prepuberty
- a period of two years immediately prior to the onset of puberty when growth and changes leading to sexual maturity occur
- Iron Age
- (archeology) the period following the Bronze Age; characterized by rapid spread of iron tools and weapons
- hockey season
- the season when hockey is played
- twentieth century
- the century from 1901 to 2000
- sabbatical
- a leave usually taken every seventh year
- Christian year
- the year in the ecclesiastical calendar; especially feast days and special seasons
- Margasivsa
- the ninth month of the Hindu calendar
- legal age
- the age at which persons are considered competent to manage their own affairs
- OWLT
- the elapsed time it takes for light (or radio signals) to travel between the Earth and a celestial object
- value
- (music) the relative duration of a musical note
- middle age
- the time of life between youth and old age (e.g., between 40 and 60 years of age)
- sidereal year
- the time for the earth to make one complete revolution around the sun, relative to the fixed stars
- Reconstruction Period
- the period after the American Civil War when the southern states were reorganized and reintegrated into the Union; 1865-1877
- Walpurgis Night
- eve of May Day
- menstrual phase
- the phase of the menstrual cycle during which the lining of the uterus is shed (the first day of menstrual flow is considered day 1 of the menstrual cycle)
- April
- the month following March and preceding May
- saint's day
- a day commemorating a saint
- seedtime
- the time during which seeds should be planted
- hebdomad
- any period of seven consecutive days
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