Nouns denoting time and temporal relations

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
 
Armed Forces Day
the 3rd Saturday in May
 
reign
a period during which something or somebody is dominant or powerful
 
Pliocene epoch
from 13 million to 2 million years ago; growth of mountains; cooling of climate; more and larger mammals
 
field day
a time of unusual pleasure and success
 
Ash Wednesday
the 7th Wednesday before Easter; the first day of Lent; the day following Mardi Gras (`Fat Tuesday'); a day of fasting and repentance
 
relaxation time
the time constant of an exponential return of a system to equilibrium after a disturbance
 
1840s
the decade from 1840 to 1849
 
nineties
the decade from 1990 to 1999
 
school term
the time during which a school holds classes
 
moment of truth
the moment in a bullfight when the matador kills the bull
 
lunisolar calendar
a calendar based on both lunar and solar cycles
 
muzzle velocity
the velocity of a projectile as it leaves the muzzle of a gun
 
Messidor
tenth month of the Revolutionary calendar (June and July); the month of harvest
 
canonical hour
(Roman Catholic Church) one of seven specified times for prayer
 
day of rest
a day set aside for rest
 
yore
time long past
 
sick leave
a leave of absence from work because of illness
 
Cinco de Mayo
the fifth of May which is observed in Mexico and Mexican-American communities in the United States to commemorate the Mexican victory over the French in the Battle of Puebla in 1862
 
Pluviose
fifth month of the Revolutionary calendar (January and February); the rainy month
 
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