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extrapolation (noun) estimation based on known facts.
When you estimate unemployment figures in five from now on the basis of the figures for the present, you extrapolate the number of people that will be unemployed in five years from now. The profits of a company for the coming year are extrapolated, if they are estimated on the basis of its profits in the past year. The inflation for the future years is extrapolated if it is estimated on the basis of the present inflation and present trends of the economy.
- On the basis of the rate of the growth of population over past five years, a birth rate of at least ten children a second on average is extrapolated in the country in the coming year.
- On the basis of the rate of economic growth over the past five years, researchers have extrapolated a per capita income of $ 1000 by the beginning of next year.