glossary * T *
Demographical and statistical terms  Symbols 
total divorce rate is the summation of the agespecific divorce rate and is defined for men or women. This rate is an indicator of a synthetic cohort giving the total number of divorces a men or a woman experiences on average throughout life based on observed period rates. 

total numbers years is the number of personyears lived at age x and older. 
T _{x} 
total reproduction rate (or total fertility rate) is the summation of the series of agespecific fertility rates, or the average number of children that would be born alive to a hypothetical cohort of women if, throughout their reproductive years, the agespecific rates for the specified year remained unchanged. 
TFR 
true rate of natural increase r see: intrinsic rate of natural increase. 
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