Of or involving the cells of an organization or movement: The assessment of opposition to any totalitarian regime ... is notoriously difficult, for any effective movement must be secretive and cellular (Anthony Sampson). 4. Of or relating to a cellular telephone.
In the past, a human generation has been considered to be 20-25 years. Older genealogical documents will use these numbers. However, genealogical studies have revealed that this is too simplistic and can result in large inaccuracies during statistical calculation.
In mammals, the length of time from conception to birth. The average gestation time is a species-specific trait. In humans, the average length, as calculated from the first day of the last normal menstrual period, is 280 days, with a normal range of 259 days (37 weeks) to 287 days (41 weeks).