Nouns denoting time and temporal relations

sidereal year
the time for the earth to make one complete revolution around the sun, relative to the fixed stars
 
workday
the amount of time that a worker must work for an agreed daily wage
 
decennium
a period of 10 years
 
mean solar time
(astronomy) time based on the motion of the mean sun (an imaginary sun moving uniformly along the celestial equator)
 
school year
the period of time each year when the school is open and people are studying
 
1980s
the decade from 1980 to 1989
 
public holiday
authorized by law and limiting work or official business
 
Tevet
the fourth month of the civil year; the tenth month of the ecclesiastical year (in December and January)
 
uptime
a period of time when something (as a machine or factory) is functioning and available for use
 
birthday
an anniversary of the day on which a person was born (or the celebration of it)
 
letup
a pause during which things are calm or activities are diminished
 
social season
the season for major social events
 
Y2K
the year 2000 in the Gregorian calendar
 
quarter
(football, professional basketball) one of four divisions into which some games are divided
 
data rate
the rate at which circuits or other devices operate when handling digital information
 
msec
one thousandth (10^-3) of a second
 
first quarter
the first fourth of the Moon's period of revolution around the Earth
 
February
the month following January and preceding March
 
May
the month following April and preceding June
 
incubation
(pathology) the phase in the development of an infection between the time a pathogen enters the body and the time the first symptoms appear
 
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