...sons born within a specified period of time, generally taken as a calendar year. The term {{TextTerm|cohort|2|116}} denotes a group of persons who experien ...omplete their studies at a particular school or university in a particular year.}}

...population or a sub-population in a specified period of time, usually one year. Although this usage is recommended, the term has steadily acquired a wider ...languages to avoid the confusion with the inverse temporal dimension (per year) of a rate: number of demographic events divided by the time exposure or pe

.... Where the fraction of the last complete year lived is counted as a whole year, as in some actuarial applications, we speak of {{TextTerm|age at next birt ...ng the population by {{TextTerm|year of birth|5|325|OtherIndexEntry=birth, year of ...}}. Graphically an age distribution may be represented by a {{TextTer

...s to deaths after the neo-natal period, but before reaching the age of one year. ...rtality, foeto-...}} includes stillbirths and deaths of children under one year.

...s may be asked on deaths during a reference period, generally the previous year; the {{NoteTerm|indirect estimation of mortality|OtherIndexEntry=estimation ...rs lived|OtherIndexEntry=number of years lived, total ...|OtherIndexEntry2=year lived, total number of years lived|OtherIndexEntry3=life, total number of y

...age at marriage}} ({{RefNumber|50|4|1}}) and, for some, to end at 45 or 50 year. The temporary absence of menstruation, be it normal or pathological, is ca ...childbearing or not during the period under review. When it concerns the complete reproductive period, the term {{NewTextTerm|total infertility|3|OtherIndexE

...od. The rate is usually stated per 1,000, and the most usual period is one year. Where the term birth rate is used without qualification, it is understood ...ital status. Rates based on a narrower age range (usually one-year or five-year age groups) are called {{TextTerm|age-specific fertility rates|9|633|IndexE

...of ...}} requires a system of recording movements as they occur. The most complete migration statistics are developed from population registers in which all c ...pulation size of the {{NonRefTerm|cohort}} ({{RefNumber|11|7|2}}) over the year. The cumulation of these rates for a cohort up to a given date provides an

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