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Expectancy

From Boercade

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Etymology of expectancy.png

expectancy = ex + spect + ancy

ex-: out

spect: derived from Latin "specere", meaning "look"

-ancy: the value of doing something

So expectancy means: 

The value of looking out for.

Further, it means "the value of expecting".

It is always used in statistics, meaning "average".

Evolution of usage

The life value of looking out for in poor country is low.

=>

The life value of expecting in poor country is low.

=>

The life expectancy in poor country is low.

Life Expectancy.png

Related vocabulary

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expectable
expection
expectation
expectative
expectant
expectance
expectancy