From Longman Dictionary of Contemporary Englishmultimillionairemul‧ti‧mil‧lio‧naire /ˌmʌltɪˌmɪljəˈneə $ -ˈner/ noun [countable] RICHsomeone who has many millions of pounds or dollars
Examples from the Corpus
multimillionaire• Forbes, 48, a multimillionaire funding his presidential bid with his own money, has never held elective office.• Steven Jobs built his own computer company from scratch and became a multimillionaire before his thirtieth birthday.• Noye rose from the council estates of London's Bexleyheath to become a multimillionaire.• The city had paid him quite adequately for the right, but it had not made him a multimillionaire.• Big talk may not be the style of Bob Rubin, banker and multimillionaire.• Politicians may have qualms about subsidizing profitable businesses owned by multimillionaires.• Even multimillionaires don't like getting blood all over their soft, beige leather bucket seats.From Longman Business Dictionarymultimillionairemul‧ti‧mil‧lio‧naire /ˌmʌltɪˌmɪljəˈneə-ˈner/ noun [countable] someone who has many millions of pounds, dollars etcThe former Warner executives are all multimillionaires. 