Nouns denoting time and temporal relations

Christian era
the time period beginning with the supposed year of Christ's birth
 
red-letter day
a memorably happy or noteworthy day (from the custom of marking holy days in red on church calendars)
 
sabbatical year
a sabbatical leave lasting one year
 
kHz
one thousand periods per second
 
luminous flux
the rate of flow of light energy
 
wpm
the rate at which words are produced (as in speaking or typing)
 
Age of Reptiles
from 230 million to 63 million years ago
 
annum
(Latin) year
 
mid-March
the middle part of March
 
1950s
the decade from 1950 to 1959
 
long run
a period of time sufficient for factors to work themselves out
 
ROI
(corporate finance) the amount, expressed as a percentage, that is earned on a company's total capital calculated by dividing the total capital into earnings before interest, taxes, or dividends are paid
 
mid-September
the middle part of September
 
Olympiad
one of the four-year intervals between Olympic Games; used to reckon time in ancient Greece for twelve centuries beginning in 776 BC
 
Christmas Day
a Christian holiday celebrating the birth of Christ; a quarter day in England, Wales, and Ireland
 
old
past times (especially in the phrase `in days of old')
 
name day
the feast day of a saint whose name one bears
 
running time
the length of time that a movie or tv show runs
 
period
the end or completion of something
 
anniversary
the date on which an event occurred in some previous year (or the celebration of it)
 
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