When?

1830s
the decade from 1830 to 1839
 
Golden Age
(classical mythology) the first and best age of the world, a time of ideal happiness, prosperity, and innocence; by extension, any flourishing and outstanding period
 
prepuberty
a period of two years immediately prior to the onset of puberty when growth and changes leading to sexual maturity occur
 
turnaround time
time need to prepare a vessel or ship for a return trip
 
red-letter day
a memorably happy or noteworthy day (from the custom of marking holy days in red on church calendars)
 
Shrove Tuesday
the last day before Lent
 
mid-July
the middle part of July
 
Olympiad
one of the four-year intervals between Olympic Games; used to reckon time in ancient Greece for twelve centuries beginning in 776 BC
 
bicentenary
the 200th anniversary (or the celebration of it)
 
second trimester
time period extending from the 13th to the 27th week of gestation
 
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
 
day
an era of existence or influence
 
Saint Agnes's Eve
a Christian holy day
 
Middle Paleolithic
the time period of Neanderthal man; ended about 35,000 years BC
 
wedding night
the night after the wedding when bride and groom sleep together
 
Trinity Sunday
eighth Sunday after Easter
 
trimester
a period of three months; especially one of the three three-month periods into which human pregnancy is divided
 
Germinal
seventh month of the Revolutionary calendar (March and April); the month of buds
 
anaphase
the stage of meiosis or mitosis when chromosomes move toward opposite ends of the nuclear spindle
 
Palm Sunday
Sunday before Easter
 
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