DEFINITION of 'Decamillionaire'

Decamillionaire is a term used for an individual with a net worth of over ten times a million. The term decamillionaire is made up of two words, “deca” and “millionaire.” The word “deca” or “deka” is of Greek origin, meaning ten. The International System of Units(SI) also defines the prefix “deca” as ten. While the word millionaire is used for someone whose net worth or wealth is equal to or more than a million (1,000,000). When we combine these two to reflect the wealth of a person, it becomes ‘ten times a million,’ which mathematically works out as: 10 x 1,000,000 = 10,000,000. 

BREAKING DOWN 'Decamillionaire'

Often, wealthy individuals are clubbed together in the category of ‘millionaires’ or ‘multimillionaires’, but this segregation is too broad to accurately describe a person's wealth. Thus, additional terms within the millionaire category have been introduced over time to provide a more exact representation of one’s wealth.

Say, a person who has 2,500,000 can be called a multimillionaire and so can somebody who has 10,000,000. While the first one has ‘2.5 times a million’, the second one has ’10 times a million’, which is a sizeable difference. Thus, the term decamillionaire is used to reflect the size of one's wealth more precisely. 

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