Actuary (noun)

1. A person who calculates and advises on financial risks and liabilities.
2. A professional who specializes in the use of mathematical and statistical methods to assess risk and uncertainty.

Origin:

Early 18th century: from latin actuarius, from actus, past participle of agere "do, perform".

Examples:

1. He became an actuary after graduating from university.
2. An actuary working for an insurance company.
3. The actuary calculated the risk of the company's investment portfolio.
4. The actuary helped the company to design a new pension plan.
5. Actuaries are in high demand in the finance and insurance industries.